JPS5929118A - Prevention of separation of welded thermoplastic synthetic resin bands from each other - Google Patents

Abstract

PURPOSE:To prevent effectively and securely overlapped bands from being peeled even if stress is given in the peeling condition at the boundary end by providing auxiliary piercing holes near main welded piercing holes formed on the overlapped parts of bands. CONSTITUTION:A suitable number of welded piercing holes 16 are provided nearly in the middle part of the overlapped parts of PP bands 10, 10 and a prescribed number of auxiliary welded piercing holes 22 are provided so that they can connect with the welded piercing holes 16 or independently of each other. It becomes difficult to tear and separate them from each other. When the PP bands 10, 10 are overlapped so that they cross with each other, crossed welded piercing holes 18 and a prescribed number of auxiliary welded piercing holes 24 are formed at the cross part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing peeling of bonded thermoplastic synthetic resin bands.

Thermoplastic synthetic resin bands have recently come to be suitably used for packaging boxes such as cardboard boxes and for binding bundles of rods and the like. For example, as shown in FIG. 1, a thermoplastic synthetic resin band 10 such as polypropylene is wrapped around a box 12, and the overlapped portions 14 of the band 10 are joined by means such as heat welding. The content is

This thermoplastic synthetic resin band is generally made of a linear polymeric material such as polypropylene or nylon (currently polypropylene is mostly used as the material).
Since it is generally abbreviated as PP band, the term rppPP band will be used hereafter as a general term for thermoplastic synthetic resin bands).It exhibits significant molecular orientation in the stretching direction, resulting in large tensile strength, and the mutual superposition of the bands. It has excellent suitability as a binding material, as it can be easily joined by heat welding the parts.

When joining the PP bands, conventionally, as shown in FIG. 2, approximately the entire contact surface where the PP bands 10 are overlapped with each other (as indicated by the dashed dotted line a).

(within the area surrounded by b), the entire surface was welded.

This method is generally called hot plate welding, in which a hot plate is inserted between the overlapping parts of the PP band, and both 1" P bands are pressed together, melting the area before the band contacts the hot plate. After the hot plate is pulled out, both PP bands are further crimped to perform joining.

However, in the hot plate welding method described above, the mechanism of the binding device used to carry out the process is complicated and large, and the manufacturing cost is 1 to 1.
The disadvantage is that it is expensive. For this reason, for example, Tokko Sho/1
As described in Japanese Patent No. 9-2319, a heating tool having a plurality of parallel heating blades is pressed parallel to the tension direction of the pp band to melt and penetrate the band.

Thereafter, a technique for bonding the fused portions by crimping has been proposed and has already been put into practical use. When using this technology,
The structure of the binding device that performs this has been simplified, making it lower in size, smaller in size, and lighter in weight. However, in this technology, crimping the fused portion after penetrating the melt is not necessarily essential for practical application. The key point (!Not 1. In any case,
In this way, by forming a through hole in the overlapping part of P1] hands and melting the periphery of the through hole, both bands can be suitably joined, and this technique can also be called a through welding method. FIG. 3 shows an example of the bonding form of the bands welded together. As shown in the figure, a plurality of elongated melting through holes I6 are formed in the stretching direction of the band 10, and the peripheral edges of the through holes 16 are welded. Figures and Special Publication Showa 49-232
1. According to this joining form, which is also disclosed in FIG. 3 of Publication No. 1G is borne evenly by the entire weld, so the third
As shown in the figure, a large shearing strength in the direction of χ, , L, 'Jj at J'9 is obtained, and it is sufficiently practical.

By the way, in the bonding form shown in FIG. 3, a through hole is formed in the overlapping part of the Pl band.
It is impossible to provide a welded part over almost the entire area of the overlapping part as shown in Figure 2, and therefore the welding through hole, represented by a long and narrow strip, is formed at the overlapping part of the band. There are circumstances that force it to be formed approximately in the center of the area.

Therefore, the contact area of the boundary end of the other band 10, which is located in the direction of extension of the band 10 on the - side (the hatched area between the dashed-dotted lines c and d in FIG. 3), In this case, no melted zone was formed at all. In addition, for the item to be packed, 1) If you want to cross the P band by horizontally binding and fir binding and crossing the phase IT and welding the intersection to prevent it from being pulled out, as shown in Figure 4, - It is preferable to form the letter-shaped melting through holes 18 at an angle of about 45° in each direction of stretching of the PP band 10; No melted portion is formed in the contact portion (indicated by diagonal lines in FIG. 4) of the boundary end of the other band 10 located therein.

Therefore, as shown in FIG. 5, when an external stress is applied to the boundary end in the y direction, the peel strength in the i6 fusion through-hole 1G is not large, so it tends to peel off easily. That is, according to the so-called penetration welding method described above, sufficient shear strength can be obtained in the stretching direction (the χ1° direction in FIG. 3), but there is a drawback that the peel strength in the y direction is not sufficient. Since the risk of stress being applied in the y direction to the boundary end of the band often occurs in various handling conditions during the logistics process, countermeasures have been needed.

The present invention has been proposed in view of the above circumstances, and has the following features: l]r) When bonding is performed by forming a melting through hole in the overlapping part of the bands, there is no possibility that the boundary end will be exposed in the peeling direction. The purpose is to effectively and reliably prevent peeling even when stress is applied.

In order to achieve this objective, the peeling prevention method according to the present invention includes:
When joining the bands, the thermoplastic synthetic resin bands are overlapped with each other, and a welded piece is forcibly pressed against the overlapping portion to form a through hole in which the peripheral edges are fused. Forming a melting through hole that can obtain sufficient shear strength in the stretching direction approximately in the center of the overlapping part,
Furthermore, a melting through-hole is formed in the vicinity of the boundary end of the other band, which is oriented in the extending direction of one band, to prevent the boundary end from turning over.

Next, regarding the method for preventing peeling of a PP band according to the present invention,
IjT will be described in detail below with reference to the accompanying drawings, including examples thereof. In the present invention, when carrying out the melt penetration method, as previously explained with reference to FIGS. In view of the fact that it is impossible to form a melted part on the contact surface of each boundary end, a 1-volume through hole is also formed at this boundary end to prevent turning over from the end. This is to prevent That is, in order to join the PP bands by the melt penetration method, the known technique is to temporarily overlap the PP pans 1-' with each other and forcibly press the heated molten metal 1-1 onto the overlapped portion. A through hole is formed through the hole, and the peripheral edges of the through hole are brought together.

At this time, as shown in FIG. 6, 1) l) Band 1 [).

An appropriate number of melting through-holes I6 are formed in the direction of the stretching force, preferably from the holes 1', l', J-<, to obtain sufficient shear strength in the stretching direction, approximately at the center of the upper part of the overlapping portions of 10.
"I' tr 11 is formed. Further overlapped I) 1
] In the vicinity of each cut end 20 of bands +C+ and +0,
A predetermined number of! f? ) M! The through hole 22 is melted into the through hole 1.
6 and 1' 1) above), even if an external stress is applied to the end in the y direction as shown in Fig. 5 for one day, the stress will not exceed the predetermined limit. As long as it is within
It is prevented from peeling off and therefore does not peel off easily.

In addition, as shown in FIG. 7, P l) The bands 10 are overlapped so as to intersect with each other, and a single-shaped melting through hole 18 is formed at the intersection at an angle of about 45° with respect to the band stretching direction. When forming one band loa, a predetermined number of melting through holes 24 are formed near the longitudinal end of the overlapping portion of the other band IOb which is overlapped so as to intersect with one band loa. PP
A melting through hole is formed approximately in the center of one part of the overlapping band to provide sufficient shear strength in the stretching direction.
A melting through hole is formed in the vicinity of each boundary end to prevent the boundary end from turning over.

The patterns of the melting through-holes formed close to the boundary V and l ends can have various forms, and can be broadly classified into the following two types.

■ A melting through hole that bears the shear stress mainly in the stretching direction, which is formed approximately in the center of the overlapping band portion;
fff is formed close to the boundary edge and bears peeling stress.
ff through-hole, integrated pattern. Examples thereof are shown in FIGS. 8(a) to 8(g).

That is, in the figure, the melting through holes 22 that bear peeling stress and prevent the boundary edges from turning up are (a) horseshoe-shaped, (b) circular, (C) elliptical, (d) semicircular, and (e) Square, (f
) Various shapes such as rectangle, (g) triangle and other polygons are possible, and each melting through hole 22 is integrated with the main melting through hole 1G that bears shear stress and communicates spatially.・I'm here. In this case, the opening width of the melting through hole 22 refers to the width of the melting through hole 16 that integrally communicates with the melting through hole 22.
It is preferable to set it to a value larger than the actual value.

■ Melting through holes that bear the shear stress in the stretching direction,
A pattern in which the melting through holes that bear peeling stress are separated. Typical embodiments include the configurations shown in FIGS. 6 and 7, and another preferred embodiment is shown in FIGS. 9(a) to Cf.
). The melting through hole 22, which bears this peeling stress and prevents the boundary end from turning over, may have various shapes other than those shown in the drawings.

Melting through holes 16.2 in various patterns shown in ■ and ■ above
2 can be easily carried out by changing the shape of the welding process J1 provided in the band binding device, and since the band binding device itself used to implement this method is a known one, I will spare you the detailed explanation.

As described above, according to the method for preventing peeling of a PP band according to the present invention, in addition to forming a melting through hole that can obtain sufficient shear strength in the stretching direction at approximately the center of the overlapped portion of the PP band, A separate melting through hole was formed near the boundary end of the other band located in the stretching direction of one band, so even if stress in the peeling direction is applied to the end, it will not peel off easily. Therefore, the PF'' band can fully exhibit its function as a binding material.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a state in which PP bands are wrapped and tied around a cardboard box, Fig. 2 is a perspective view showing a state in which F) P bands are joined by a conventional hot plate welding method, Fig. 3, and Figure 4 is a perspective view showing various patterns joined by the penetration welding method, and Figure 5 is an example of a band with the joining pattern shown in Figure 3. l) External stress in the y direction is applied to the band. 6 and 7 are perspective views showing bonding patterns of the PP band applied with the method for preventing peeling according to the present invention, and FIGS. 8 and 9 are explanatory diagrams showing a state in which the PP band easily peels off. FIG. 2 is an explanatory diagram comprehensively showing various bonding patterns when implementing the peeling prevention method according to the present invention. 10...PI) Band+6. ] 8, 22. 24... Melting through hole-1j
1. (□' FIG, 1 FIG, 2 FIG, 4 F! 3.3 FIG, 6 FIG, 7 0 FIG, 8 6 FIG, 9 - Supplementary Procedures J-E (self-prompted) 1982 "November 9 Patent Director-General Kazuo Wakasugi 1, Indication of the case Patent Application No. 1983] 38755
No. 2, Name of the invention Method for preventing peeling of bonded thermoplastic synthetic resin bands 3.
Relationship with the person making the amendment Patent applicant address 14-10 Kamejima 2-chome, Nakamura-ku, Nagoya
Name Tomi 1 Co., Ltd.: Mu #! Z Manufacturing 1L ↑ Representative Student 1) Take 1.4, Agent 460, Address 5-3-11 Sakae, Naka-ku, Nagoya (1) Name column of the invention in the application form (2) In the description “Title of the invention”, “Claims”, “Detailed description of the invention” and “Brief description of the drawings” (3) Drawing amendment document Japanese Patent Application No. 138755/1986 No. I, page 1, lines 2 to 4 of the specification are amended as follows. "1. Name of the invention: Method for joining thermoplastic synthetic resin bands", 2. The 5th to 15th lines of the first page are corrected as follows. "2. Claims: Thermoplastic synthetic resin bands are stacked on top of each other and welded to the middle part of the bands] By forcibly pressing the two pieces together to form a through hole where the peripheral edges are fused, both bands A joining force d of thermoplastic synthetic resin bands, characterized in that a main melting through hole is formed in the upper part of the overlapping hand, and an auxiliary through hole is formed in proximity to the upper melting through hole; 3, page 1, lines 17 to 18, ``This invention is...'' [This invention relates to a method for joining thermoplastic synthetic resin pans 1-. ” he corrected. 4. Delete "This bonding form..." from lines 8 to 13 on page 4. 5. Page 5, line 1/1, "Therefore, as shown in Figure 1."
The tensile stress applied to the PP pan when bundling the items to be packed is:
Since the load is borne only by the welded peripheral edge of the melting through hole 16, sufficient tensile strength cannot be obtained, and this often causes the welded peripheral edge to split and break. Again,” he corrected. 6, page 6, line 7 Moreover,” he corrected. 7 Page 6, lines 11 to 19 [The method is...] ``The method is to stack the Netsumachi plastic synthetic resin bands on top of each other, and forcibly apply a welding force of 1 to 100 ml to the bonded parts to fuse the peripheral edges and form a through hole. 1, characterized in that, in the direction θt where both bands are joined, a melting through hole is formed in the overlapping portion of the pan 1, and an auxiliary through hole is formed in proximity to the upper melting through hole; ”
and correct it. 8, page 8, line 1, [by doing so, the band where the two bands are integrally melted and joined] increases, and the strength of the bond is increased. Therefore, the tensile strength is significantly increased and reinforced. In addition, the cut end portion of the band 10 is corrected. 9 Shown in page 10, line 1 [. Further, another embodiment is shown in FIGS. 10 to 12. In other words, FIG. Auxiliary through holes 22 and 22 are formed by melting in the center of the front and rear sides in the longitudinal direction, and FIG. 11 shows the auxiliary through holes 2.
2 into two j: barrel through holes 16. They are each melted and formed inwardly at the center sandwiched by If3. Also, Figure 12 is ■
1) In the case where the bands are superimposed so as to cross each other, the main through holes 16.16 are melt-formed diagonally in parallel, and the auxiliary through-holes 22.22 are melt-formed as shown. ” he corrected. IO, page 10, lines 12 to 17 [according to the above-mentioned end] ', t' to the overlapping part of the PP pan 1~
In addition to forming a barrel melt-through flower festival, a reinforcing melt-through hole was formed in the vicinity of this through-hole to make the weld joint of both bands sufficiently large, so that the joint strength in the direction of tensile force was extremely high. , since the ends of the reinforcing through-holes are strongly polymerized, it is corrected to "at the ends". 11 On page 11, line 12, "Figures 13 and 9" is corrected to "Figures 8 to 12." Patent applicant: Fuji Machine Manufacturing Co., Ltd.FIG, 1
0 FIG, 12

Claims (1)

[Claims] Thermoplastic synthetic resin bands are stacked on top of each other. When joining the band by forcibly pressing one processed piece against the overlapping part to form a through hole with fused peripheral edges, the hand-held overlapping part has a sufficient area approximately at the center in the stretching direction. A melting through hole is formed that provides a shear strength of 1. A method for preventing peeling of a bonded thermoplastic synthetic resin pan l-, the method comprising: forming a bonded thermoplastic synthetic resin pan l-.