TW202144243A - Plastic line joining method and structure for folding edge of bulk bag improving structure strength of folding edge to greatly reduce possibility of deformation or damage - Google Patents

Abstract

A plastic line joining method and structure for folding edge of bulk bag includes: tiling a folding edge of a bulk bag on a metal made solid surface; keeping the solid surface at a condensation temperature through a cooling apparatus; executing a needle entering action on a site of the folding edge through an injection needle head connected to an injection machine, and solidifying and crystallizing a position on the bottom surface of the folding edge corresponding to the pinhole to form a base point; executing, by the injection needle head, a needle exiting action to fully fill the pinhole with molten plastic material, and pressurizing and imposing cold air to instantly cool and condense the molten plastic material in the pinhole to form a linear column; next horizontally moving the injection needle head or the folding edge with a distance, and pressurizing and applying cold air to condense the molten plastic material to form a linear bridge; and repeating the afoementioned processes to perform the needle entering action, and the needle exiting action, and the horizontal moving action on the next site of the folding edge to form the next base point, the linear column, and the linear bridge; wherein plural base points, the linear columns, and the continuous linear bridges are formed into a plastic line joining structure having high strength and low extension rate along the folding edge.

Description

Plastic wire bonding method and structure for hemming of container bag

The present invention relates to a flexible transport packaging container, and more specifically, relates to a method and structure for folding and joining of bulk bags (or space bags and ton bags).

The container bag (or space bag, ton bag) is a flexible transport packaging container, which has the characteristics of large volume, light weight, easy loading and unloading, etc. It can be transported by a crane or forklift. The shipping packaging of the material.

The container bag uses polypropylene (Polypropylene, PP for short) as the main raw material. After adding a small amount of stable materials, it is evenly mixed, and then melted and extruded by an extruder. The PP raw silk with low strength and low elongation is made into bag cloth by weaving and laminating, and then sewed with accessories such as slings.

When the container bag is produced and processed, the bag cloth needs to be folded and stitched to ensure the integrity and strength of the container bag. As shown in Figure 1, the hem stitching is performed with cotton thread and a sewing machine. The sewing machine sews one or more suture structures by cooperating with the linear movement of the reciprocating needle 1 and the folding of the bag cloth. Microscopically, the suture structure includes a pinhole 2, an upper thread 3 and a lower thread 4 that pass through the pinhole 2 and are connected up and down, and an upper interlocking thread 5 and a lower interlocking thread 6 on the surface of the bag cloth.

Figure 1 further discloses the usual situation of sewing, that is, the hole diameter of the pinhole is larger than the thread diameter of the cotton thread, so there is a gap between the pinhole and the cotton thread, which is easy to cause the problem of powder leakage of the container bag, and the traditional solution to this problem is The method is to set up another leak-proof structure or set up a leak-proof inner bag in the container bag, but increase the system. process trouble. In addition, the pinhole causes puncture structural damage to the container bag, but the cotton thread cannot make up for this damage, and the thicker the diameter of the thread used, the larger the diameter of the pinhole, the stronger the degree of puncture damage, and the cotton thread and the pinhole are along the Aligned in a straight line, forming a continuous unstable structure for the FIBC. Furthermore, when the FIBC holds heavy materials and is suspended for transportation, the pinholes will become larger and larger due to the pulling of the weight of the bag body, which may lead to the problem of breakage. In addition, cotton thread and container bag are made of different materials. When the container bag is discarded and recycled, it is extremely difficult to remove the suture. Therefore, the method of cutting and folding is adopted, which causes troubles in the recycling process.

In order to solve the above problems, the present invention proposes a novel plastic wire bonding method and structure for hemming of a container bag.

Technical features of the present invention:

A plastic wire bonding method for folding a container bag, comprising:

Step 1, laying a folded edge of a bulk bag on a metal solid surface; keeping the solid surface at a condensation temperature by a cooling device;

In step 2, an injection needle connected to an injection machine performs a needle insertion action at a point of the folded edge. The needle insertion action causes the injection needle to pierce the fold to form a needle hole. The molten plastic is injected, and the molten plastic is rapidly cooled when it contacts the solid surface, and solidifies and crystallizes on the bottom surface of the folded edge at the corresponding pinhole to form a base point; the range of the base point is greater than the diameter range of the pinhole;

Step 3, the injection needle performs a needle-out action to escape from the needle hole, and the needle-out action is the reverse of the needle-in action; while the needle-out action is performed, the needle tip continues to inject the molten plastic, so that the molten plastic is Fill in the pinhole; at the same time, a pressurized cold air is applied from the upper surface of the hem to the hole needle; through the cooling action of the pressurized cold air, the molten plastic filled in the needle hole is instantly cooled and condensed into a thread column, and the thread column, the folded edge and the base point are condensed into one;

Step 4, the injection needle or the folded edge moves in translation for a distance, while the needle tip continues to inject molten plastic on the upper surface of the folded edge, the pressurized cold air is still continuously supplied, so that the molten plastic is instantly condensed into a wire bridge. , the wire bridge and the upper surface of the folded edge are condensed into one;

Step 5, repeat steps 2 to 4, and perform the needle insertion action of step 2, the needle out action of step 3, and the translation action of step 4 at the next position of the folded edge, so as to form the next base point, line column, and wire bridges; a plurality of base points, wire posts, and continuous wire bridges form a high-strength, low-elongation plastic wire-bonding structure along the hem.

A plastic wire bonding structure for hemming of a container bag, comprising:

a folded edge of a bulk bag;

a number of base points equidistantly condensed on the bottom surface of one of the folds along the length of the fold;

Several line pillars running through and condensed inside the folded edge, a bottom end of the line pillar and a base point are condensed into one;

Several wire bridges are condensed on a top surface of the folded edge, wherein the two ends of each wire bridge are respectively condensed into one with the top ends of the two adjacent wire columns.

Compared with the prior art, the improvement effect of the present invention is:

The method of the present invention condenses the molten plastic into the above-mentioned plastic wire bonding structure and then joins the folded edges of the container bag. The folded edge can be joined and further integrated with the folded edge, and the tightness is greatly improved, and the plastic wire joint structure will not be separated from the folded edge, and its fixation can be maintained for a long time.

Base points, posts, and continuous wire bridges keep the plastic wire joint structure stable on the hem , not easy to break. Even the occasional local breaking point will not affect the overall fixation and tightness.

Although the aforesaid needle insertion action forms a pinhole in the folded edge, it is then filled with molten plastic and condensed into a thread column. Completely make up for pinholes, so that the plastic wire bonding structure becomes pinhole-free, and when the container bag holds powder, the problem of powder leakage from the plastic wire bonding structure will not occur. When the container bag is deformed due to load-bearing and hoisting, the high-strength and low-elongation plastic wire bonding structure enhances the structural strength of the folded edge and greatly reduces the probability of deformation or damage.

Because the plastic wire bonding structure and the container bag are made of the same material, when the container bag is discarded, all plastics can be recycled, reducing the trouble of the recycling process.

The method and structure of the present invention are not only applicable to bulk bags, other plastic bags can also be joined by the method and structure of the present invention.

10: Solid Faces

11: Cooling device

20: Injection needle

21: Needle Tip

22: Pressurized cold air

23: Presser foot

30: Plastic wire bonding structure

31: basis point

32: Line Post

33: Wire Bridge

40: FIBC

41: Folding

[FIG. 1] is a schematic diagram of the sewing structure of the prior art container bag.

[FIG. 2] is a schematic diagram of the mechanism of the plastic thread sewing structure of the container bag of the present invention.

[FIG. 3] is a schematic diagram of the operation of the method of the present invention.

[FIG. 4] is the second schematic diagram of the operation of the method of the present invention.

[FIG. 5] is the third schematic diagram of the operation of the method of the present invention.

[FIG. 6] is the fourth schematic diagram of the operation of the method of the present invention.

FIG. 7 is the fifth schematic diagram of the operation of the method of the present invention.

[Fig. 8] is a schematic cross-sectional view of the plastic thread stitching structure for hemming of the container bag according to the present invention.

[Fig. 9] is a schematic top view and a partial enlarged schematic view of the frame selection part of the first embodiment of the plastic thread stitching structure for hemming of the container bag according to the present invention.

[Fig. 10] is a schematic top view and a partial enlarged schematic view of the frame selection part of the second embodiment of the plastic thread stitching structure for hemming of the container bag according to the present invention.

In order to facilitate the description of the central idea of the present invention expressed in the column of the above-mentioned summary of the invention, specific embodiments are hereby expressed. Various objects in the embodiments are drawn in proportions, dimensions, deformations or displacements suitable for illustration, rather than scales of actual elements. Identical and symmetrically configured elements are designated by the same reference numerals. The drawings are only for the convenience of describing the method of the present invention, and do not indicate or imply that the shape, configuration or orientation of the devices or elements referred to have specific limitations, and therefore should not be construed as limitations of the present invention.

The plastic wire bonding method for the folded edge 41 of the container bag 40 of the present invention includes:

Step 1 (as shown in FIG. 2 ), flatten a folded edge 41 of a bulk bag 40 on a metal solid surface 10; keep the solid surface 10 at a condensation temperature by a cooling device, and the condensation temperature is in the range of 5 °C to 20 °C, preferably 5 °C.

In step 2 (as shown in FIG. 3 ), an injection needle 20 connected to the injection machine performs a needle insertion action at a point of the folded edge 41 , and the needle insertion action causes the injection needle 20 to pierce the folded edge 41 to form a needle. Hole; through the extrusion process of the injection machine, the injection needle 20 continuously injects molten plastic from its needle tip 21, and the molten plastic is at the melting point temperature (up to 160 ° C - 190 ° C), contacting the solid surface 10 at low temperature Instantaneously cools rapidly, and solidifies and crystallizes on the bottom surface of the folded edge 41 at the corresponding pinhole to form a base point 31 . The aforementioned molten plastic is the same as the plastic for making the container bag 40, including but not limited to polypropylene (Polypropylene, PP for short), high density polyethylene plastic (High Density Polyethylene). Polyethylene, referred to as HDPE). The melting point temperature of PP is 165°C, and the melting point temperature of HDPE is 125°C to 135°C. Based on the selection of the same material, the base point 31 and the bottom surface of the folded edge 41 will be condensed into one body, but will not be fixed on the solid metal surface 10 .

Step 3 (as shown in FIG. 4 ), the injection needle 20 performs a needle ejection action to escape from the needle hole; the needle tip 21 continues to inject molten plastic while the needle ejection action is performed, so that the molten plastic is filled in the needle hole; at the same time, The pressurized cold air 22 is applied to the hole pin from the upper surface of the folded edge 41, and the temperature of the pressurized cold air 22 is 5°C to 20°C; through the cooling effect of the pressurized cold air 22, the molten plastic in the pinhole is filled It is instantly cooled and condensed into a line column 32 , and the contact surface of the line column 32 and the folded edge 41 and the base point 31 are all condensed into one. Based on the needle ejecting action and the injection pressure, the microscopic contact surface of the wire post 32 and the folded edge 41 is condensed into a rough burr shape. The wire post 32 is completely filled in the needle hole and tightly connected to the contact surface of the folded edge 41 so that the pinhole is completely free of gaps.

Step 4 (as shown in FIG. 5 ), the injection needle 20 moves in translation, and moves a distance parallel to the upper surface of the folded edge 41 , and this action can also be replaced by the movement of the folded edge 41 . Preferably, the distance is greater than the range of the base point 31 , specifically, it may be 2-3 times the diameter of the injection needle 20 , and the specific data range of the distance is 1mm-3mm. The moving distance can be adjusted according to actual needs, and the present invention is not limited to the specific data or ratio provided. While moving, the needle tip 21 continues to inject molten plastic, and the pressurized cold air 22 continues to supply, so that the molten plastic instantly condenses into a wire bridge 33 , and the wire bridge 33 and the upper surface of the folded edge 41 are condensed into one.

Step 5 (as shown in Figures 6, 7, 8), repeat steps 2 to 4, and perform the needle insertion action of step 2, the needle extraction action of step 3, and the translation action of step 4 at the next position of the folded edge 41, Accordingly, the next base point 31 , the wire post 32 , and the wire bridge 33 are formed. A plurality of base points 31 , wire posts 32 , and continuous wire bridges 33 form a high-strength and low-elongation plastic wire-bonding structure 30 along the folded edge 41 .

In terms of technical details:

The speed of the needle-in and needle-out actions should be determined according to the thickness of the hemming 41 of the container bag 40. The specific action time range for one reciprocation of needle-in and needle-out is 0.1 seconds to 1 second. In principle, the hemming 41 The thicker the thickness, the slower the speed; for example, for a hem 41 with a thickness of 1mm, the speed of needle insertion and needle extraction is set to 0.1 seconds.

The mass flow rate of the molten plastic through the needle tip 21 is 10kg/h~20kg/h. In principle, the slower the needle entry and exit movements, the smaller the mass flow rate.

The metal solid surface 10 is preferably a stainless steel plate. The methods of maintaining its condensation temperature include but are not limited to water cooling and electric cooling.

The position where the folded edge 41 is stitched with the plastic thread should be pressed by the presser foot 23 to keep it flat and not moved by the injection needle 20 .

The injection needle 20 penetrates the folded edge 41 with its needle tip 21 , and the needle tip 21 has a taper. Therefore, the pinhole and the thread column 32 formed inside the folded edge 41 may also be tapered in microscopic.

Preferably, the pressurized cold air 22 should follow the displacement of the injection needle 20 .

As shown in FIG. 9 , the plastic wire bonding structure 30 formed by performing the above steps with a single needle is a single linear type.

As shown in FIG. 10 , several needles perform the above steps at the same time, or the plastic wire bonding structure 30 formed by the reciprocation of a single needle sequence is multi-linear. Preferably, the base point 31 and the wire post 32 of one plastic wire bonding structure 30 are adjacent to the wire bridge 33 of the other plastic wire bonding structure 30 .

In the present invention, the above method can be accomplished by the reciprocating movement of the injection needle 20 relative to the folded edge 41, and the opposite change can be made accordingly, and the same can be achieved by the reciprocating movement of the solid surface 10 and the folded edge 41 relative to the injection needle 20. Effect.

30: Plastic wire bonding structure

31: basis point

32: Line Post

33: Wire Bridge

41: Folding

Claims (10)

A plastic wire bonding method for folding a container bag, comprising: Step 1, laying a folded edge of a bulk bag on a metal solid surface; keeping the solid surface at a condensation temperature by a cooling device; In step 2, an injection needle connected to an injection machine performs a needle insertion action at a point of the folded edge. The needle insertion action causes the injection needle to pierce the fold to form a needle hole. The molten plastic is injected, and the molten plastic is rapidly cooled when it contacts the solid surface, and solidifies and crystallizes on the bottom surface of the folded edge at the corresponding pinhole to form a base point; the range of the base point is greater than the diameter range of the pinhole; Step 3, the injection needle performs a needle-out action to escape from the needle hole, and the needle-out action is the reverse of the needle-in action; while the needle-out action is performed, the needle tip continues to inject the molten plastic, so that the molten plastic is Fill in the pinhole; at the same time, a pressurized cold air is applied to the hole pin from the upper surface of the folded edge; through the cooling effect of the pressurized cold air, the molten plastic filled in the pinhole is instantly cooled and condensed into a thread , the line column, the folded edge and the base point are all condensed into one; Step 4, the injection needle or the folded edge moves in translation for a distance, while the needle tip continues to inject molten plastic on the upper surface of the folded edge, the pressurized cold air is still continuously supplied, so that the molten plastic instantly condenses into a wire bridge. , the wire bridge and the upper surface of the folded edge are condensed into one; Step 5, repeat steps 2 to 4, and perform the needle insertion action of step 2, the needle out action of step 3, and the translation action of step 4 at the next position of the folded edge, so as to form the next base point, line column, and wire bridges; a plurality of base points, wire posts, and continuous wire bridges form a high-strength, low-elongation plastic wire-bonding structure along the hem. The plastic wire bonding method for hemming of a container bag according to claim 1, wherein the condensation temperature The temperature ranges from 5°C to 20°C. The plastic wire bonding method for hemming a bulk bag as claimed in claim 1, wherein the molten plastic is the same as the plastic from which the bulk bag is made. The plastic wire bonding method for hemming of the container bag according to claim 1, wherein the temperature range of the pressurized cold air is 5°C to 20°C. The plastic wire bonding method for hemming of a container bag according to claim 1, wherein the distance is 1 mm to 3 mm. The plastic wire bonding method for hemming of the container bag according to claim 1, wherein the mass flow rate of the molten plastic passing through the needle tip is 10kg/h~20kg/h. A plastic wire bonding structure for hemming of a container bag, comprising: a folded edge of a bulk bag; a number of base points equidistantly condensed on the bottom surface of one of the folds along the length of the fold; Several line pillars running through and condensed inside the folded edge, a bottom end of the line pillar and a base point are condensed into one; Several wire bridges are condensed on a top surface of the folded edge, wherein the two ends of each wire bridge are respectively condensed into one with the top ends of the two adjacent wire columns. The plastic wire bonding structure for hemming of the container bag according to claim 7, wherein the plastic wire bonding structure is a single linear type. The plastic wire joining structure for hemming of the container bag according to claim 7, wherein the plastic joining structure is a polyline type. The plastic wire bonding structure for hemming of the container bag according to claim 9, wherein the base point and the wire column of one plastic wire bonding structure are adjacent to the wire bridge of the other plastic wire bonding structure.

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