Inner bag shrink bottle and processing method thereof

Abstract

The inner bag shrinkage bottle comprises an outer bottle body, an inner bag is arranged in the outer bottle body, the opening side of the inner bag is pressed and fixed through a vacuum pump fixed to a bottle opening of the outer bottle body, the bottom of the outer bottle body is provided with a ventilation gap formed by multi-layer co-extrusion blow molding edge clamping of an inner bag material layer and an outer bottle body material layer, and the connection portions of the inner bag material layer and the outer bottle body material layer are not mutually fused. The processing method comprises the following steps: preparing a multi-layer parison; performing blow molding; and opening the mold, cutting off burrs and installing a vacuum pump. According to the inner bag shrinking bottle, the connecting positions of the inner bag material layer and the outer bottle body material layer are not fused, the ventilation gap can be formed at the bottom of the outer bottle body of the inner bag shrinking bottle through direct blow molding, the vacuum pump for pressing the opening of the inner bag at the bottle opening is matched, and the inner bag can be shrunk by directly pressing the vacuum pump; the inner bag shrinkage bottle can also prevent air from entering the inner bag, reduces the residual quantity of slurry products, and is convenient to process and low in processing cost.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging bottles, in particular to an inner bag shrink bottle and a processing method thereof. Background Art

[0002] In the prior art, a packaging bottle for containing liquid or slurry products generally includes only a bottle body. The liquid or slurry product can be food, cosmetics, etc. The bottle body has a containing cavity. The liquid product is directly loaded into the containing cavity. The packaging is completed by sealing the bottle mouth. When in use, the bottle mouth is opened to take out the liquid or slurry product inside.

[0003] However, when using liquid or paste products packaged in this way, external air will enter the bottle body, causing the liquid or paste product to come into contact with external air and oxidize and deteriorate; in addition, due to the poor fluidity of the paste product, there will be more residues in the bottle body. Therefore, there are packaging bottles with an inner bag in the outer bottle body and a one-way valve on the outer bottle body. When the liquid product inside this packaging bottle is poured out, the inner bag will shrink, and the external gas will enter the gap between the outer bottle body and the inner bag through the one-way valve to prevent the inner bag from expanding and inhaling air. However, when processing this packaging bottle, a one-way valve needs to be installed on the outer bottle body, and the inner bag needs to be loaded from the bottle mouth and the gas between the inner bag and the outer bottle body needs to be emptied before the liquid product can be loaded normally, which is inconvenient to process.

[0004] In order to simplify the processing steps, CN105764798A discloses a stacked peeling container and a processing method, in which a stacked parison in a molten state is placed on a split mold for blow molding, and the split mold is closed. Then, a blow molding nozzle is inserted into the opening on one side of the mouth of the container body, and air is blown into the mold cavity of the split mold in the state of closing the mold, so as to form a packaging container with an inner bag at one time, and then a hole is punched on the outer bottle body to pre-peel off the inner bag and install a one-way valve, and then hot air is blown on the protrusion of the bottom of the bottle to soften it, and it is bent to seal the protrusion. However, this processing method only eliminates the step of loading the inner bag, and because the part forming the inner bag and the part forming the outer bottle body are not fused, the split mold splitting the stacked parison will cause the outer bottle body to have a gap, but increases the step of sealing the protrusion. Therefore, the processing steps are not actually simplified, and the production efficiency and production cost are still not effectively reduced. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an inner bag shrink bottle and a processing method thereof. The inner bag shrink bottle can also prevent air from entering the inner bag, reduce the residual amount of the slurry product, and is easy to process and has a low processing cost.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions: an inner bag shrink bottle, comprising an outer bottle body, an inner bag is arranged in the outer bottle body, the opening side of the inner bag is pressed and fixed by a vacuum pump fixed at the bottle mouth of the outer bottle body, and the bottom of the outer bottle body is provided with a breathable gap formed by the multi-layer co-extrusion blow molding clamping edge of the inner bag material layer and the outer bottle material layer that do not blend with each other at the junction. This inner bag shrink bottle utilizes the inner bag material layer and the outer bottle material layer that do not blend at the junction, and can form a breathable gap at the bottom of the outer bottle body of the inner bag shrink bottle by direct blow molding. The vacuum pump that compresses the opening of the inner bag at the bottle mouth can be used to directly press the vacuum pump to shrink the inner bag. This inner bag shrink bottle can also prevent air from entering the inner bag, reduce the residual amount of slurry products, and is easy to process and has low processing costs.

[0007] In the above technical solution, preferably, the inner bag material layer includes an outermost EVOH layer, and the outer bottle body material layer is a HDPE layer or a PP layer.

[0008] In the above technical solution, preferably, the inner bag material layers are LDPE layer, adhesive layer and EVOH layer from inside to outside.

[0009] In the above technical solution, preferably, a flange is formed at the opening of the inner bag toward the outside of the mouth of the outer bottle body, and the vacuum pump presses the flange to fix the opening side of the inner bag to the mouth of the outer bottle body.

[0010] In the above technical solution, preferably, the outer bottle body is threadedly connected to the vacuum pump.

[0011] The processing method of the inner bag shrink bottle comprises the following steps: preparing a multi-layer parison: taking materials that do not blend with each other at the joint as the inner bag material layer and the outer bottle body material layer, placing the inner bag material layer on the inner side of the outer bottle body material layer and extruding it with a die head to form a cylindrical multi-layer parison; blow molding: closing the mold, clamping the edge of the mold so that the innermost layer of the inner bag material layer is fused, and using a blow molding nozzle to perform blow molding in the inner bag material layer, the outer bottle body material layer is blocked by the inner bag material layer and does not blend with the inner bag material layer to form a breathable gap at the bottom of the outer bottle body; opening the mold and cutting off the burrs; installing a vacuum pump: installing a vacuum pump at the bottle mouth of the outer bottle body, and the vacuum pump presses the opening side of the inner bag to fix it to the bottle mouth of the outer bottle body.

[0012] In the above technical solution, preferably, the inner bag material layer includes an outermost EVOH layer, and the outer bottle body material layer is a HDPE layer or a PP layer.

[0013] In the above technical solution, preferably, the inner bag material layers are LDPE layer, adhesive layer and EVOH layer from inside to outside.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the inner bag shrink bottle utilizes the fact that the inner bag material layer and the outer bottle body material layer are not fused at the junction, and a breathable gap can be formed at the bottom of the outer bottle body of the inner bag shrink bottle by direct blow molding, and a vacuum pump that presses the inner bag opening at the bottle mouth can be used to shrink the inner bag by directly pressing the vacuum pump. The inner bag shrink bottle can also prevent air from entering the inner bag, reduce the residual amount of the slurry product, and is easy to process with low processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0016] Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of the present invention.

[0017] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0018] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0019] Figure 5 for Figure 2 A partial enlarged view of point C in the middle.

[0020] Figure 6 It is a schematic diagram of the cross-sectional structure of the inner bag after shrinkage according to an embodiment of the present invention.

[0021] Figure 7 Schematic diagram of the processing flow of an embodiment of the present invention.

[0022] Figure 8 for Figure 7 Enlarged cross-sectional view at point D in the middle. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 8 , an inner bag shrink bottle, comprising an outer bottle body 1, an inner bag 2 is arranged inside the outer bottle body 1, the opening side of the inner bag 2 is pressed and fixed by a vacuum pump 3 fixed at the bottle mouth of the outer bottle body 1, and a breathable gap 4 is formed by a multi-layer co-extrusion blow molding clamp edge of an inner bag material layer 5 and an outer bottle material layer 6 that do not blend at the joint. This inner bag shrink bottle utilizes the inner bag material layer 5 and the outer bottle material layer 6 that do not blend at the joint to form a breathable gap 4 at the bottom of the outer bottle body 1 of the inner bag shrink bottle by direct blow molding, and cooperates with a vacuum pump 3 that presses the opening of the inner bag 2 at the bottle mouth, and directly presses the vacuum pump 3 to shrink the inner bag 2. This inner bag shrink bottle can also prevent air from entering the inner bag 2, reduce the residual amount of slurry products, and is easy to process and has low processing costs.

[0024] Compared with the traditional processing method of placing an inner bag in a bottle body, this inner bag shrink bottle has higher processing efficiency. Compared with the multi-layer co-extrusion blow-molded inner bag shrink bottle, it saves the steps of sealing the bottom of the outer bottle body and installing a one-way valve on the outer bottle body, and has a simpler structure.

[0025] In this embodiment, the inner bag material layer 5 includes the outermost EVOH layer 7, and the outer bottle body material layer 6 is an HDPE layer 8. EVOH is a polar polymer, and HDPE is a non-polar polymer, and their compatibility is relatively poor. During the multi-layer co-extrusion blow molding process, the mold clamping edge can be melted around the innermost layer of the inner bag material layer 5 to form a closed cavity, while the outer HDPE will expand as the inner bag is blown up, and due to the barrier of the inner bag material layer 5, a breathable gap 4 will be automatically formed at the bottom clamping edge.

[0026] Since PP is also incompatible with the EVOH layer, in other embodiments, the outer bottle material layer 6 can be a PP layer.

[0027] In this embodiment, the inner bag material layer 5 is composed of an LDPE layer 9, an adhesive layer 10 and an EVOH layer 7 from the inside to the outside. The LDPE molecular chain contains a large number of branches of varying lengths, and the arrangement between the molecular chains is relatively loose, so it has a low density, a soft texture, good transparency, elasticity and flexibility. The LDPE layer 9 can be expanded together with the outer EVOH layer 7 during the inflation process. On the one hand, the EVOH layer 7 plays a role in not blending with the outer bottle body material layer 6 during processing, and at the same time, it also has the function of blocking oxygen and carbon dioxide, preventing the products stored in the inner bag 2 from contacting oxygen and carbon dioxide during use.

[0028] In this embodiment, the opening of the inner bag 2 is formed with a flange 11 toward the outside of the bottle mouth of the outer bottle body 1, and the vacuum pump 3 presses the flange 11 to fix the opening side of the inner bag 2 to the bottle mouth of the outer bottle body 1. With this structure, the vacuum pump 3 can conveniently fix the opening side of the inner bag 2 to the bottle mouth of the outer bottle body 1.

[0029] Of course, in other embodiments, the opening side of the inner bag 2 may be fixed to the bottle mouth of the outer bottle body 1 by other positioning methods. For example, the main part of the vacuum pump 3 extending into the bottle mouth of the outer bottle body 1 is provided with protrusions extending toward the side wall of the bottle mouth, and these protrusions squeeze and fix the inner bag 2 in the bottle mouth of the outer bottle body 1; or the main part of the vacuum pump 3 extending into the bottle mouth of the outer bottle body 1 directly squeezes and fixes the inner bag 2 in the bottle mouth of the outer bottle body 1.

[0030] In this embodiment, the outer bottle body 1 is threadedly connected to the vacuum pump 3. This structure facilitates the connection and installation of the vacuum pump 3 and the outer bottle body 1.

[0031] See also Figures 7 and 8The processing method of the inner bag shrink bottle includes the following steps: preparing a multi-layer parison: taking materials that are not mutually soluble at the joint as the inner bag material layer 5 and the outer bottle body material layer 6, placing the inner bag material layer 5 inside the outer bottle body material layer 6 and extruding it with a die head to form a cylindrical multi-layer parison, wherein the inner bag material layer 5 is composed of an LDPE layer 9, an adhesive layer 10 and an EVOH layer 7 from the inside to the outside, and the outer bottle body material layer 6 is a HDPE layer 8. In other embodiments, changing the outer bottle body material layer 6 to a PP layer also has substantially the same effect.

[0032] Blow molding: close the mold, clamp the edge of the mold to make the innermost layer of the inner bag material layer 5 fuse, use the blow molding nozzle to blow mold in the inner bag material layer 5, the outer bottle body material layer 6 is blocked by the inner bag material layer 5 and does not fuse with the inner bag material layer 5 to form a breathable gap 4 at the bottom of the outer bottle body 1. The mold is provided with a cavity for forming threads at the bottle mouth of the cavity for forming the outer bottle body, so that the bottle mouth of the outer bottle body 1 after blow molding directly forms an external thread, so as to facilitate the threaded installation with the vacuum pump 3.

[0033] Open the mold and cut off the burrs.

[0034] Install the vacuum pump 3: The vacuum pump 3 is installed at the bottle mouth of the outer bottle body 1 by threaded fitting, and the vacuum pump 3 presses and fixes the opening side of the inner bag 2 to the bottle mouth of the outer bottle body 1 .

[0035] Figure 7 In the figure, the steps from left to right are: preparing a multi-layer parison, blow molding, opening the mold, cutting off burrs, and installing a vacuum pump.

[0036] When filling this inner bag shrink bottle, the vacuum pump 3 can be removed for filling. Since the bottom of the inner bag 2 fits the outer bottle body 1, the bag mouth of the inner bag 2 will not separate from the bottle mouth of the outer bottle body 1. The vacuum pump 3 can then be reinstalled on the outer bottle body 1.

[0037] This inner bag shrink bottle uses a vacuum pump 3 and multi-layer co-extrusion blow molding to automatically form a breathable gap 4. The inner bag 2 can be shrunk by directly pressing the vacuum pump 3, which can prevent air from entering the inner bag 2 and reduce the residual amount of the slurry product. At the same time, it makes processing more convenient and reduces processing costs.

[0038] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An inner bag shrink bottle, comprising an outer bottle body (1), wherein an inner bag (2) is arranged inside the outer bottle body (1), characterized in that: The opening side of the inner bag (2) is pressed and fixed by a vacuum pump (3) fixed at the mouth of the outer bottle body (1), and a breathable gap (4) is provided at the bottom of the outer bottle body (1) formed by a multi-layer co-extrusion blow-molded clamping edge of an inner bag material layer (5) and an outer bottle material layer (6) that are not fused at the joint.

2. The inner bag shrink bottle according to claim 1, characterized in that: The inner bag material layer (5) includes an outermost EVOH layer (7), and the outer bottle body material layer (6) is a HDPE layer (8) or a PP layer.

3. The inner bag shrink bottle according to claim 2, characterized in that: The inner bag material layer (5) comprises, from the inside to the outside, an LDPE layer (9), an adhesive layer (10) and an EVOH layer (7).

4. The inner bag shrink bottle according to claim 1, characterized in that: The opening of the inner bag (2) is formed with a flange (11) toward the outside of the mouth of the outer bottle body (1), and the vacuum pump (3) presses the flange (11) to fix the opening side of the inner bag (2) to the mouth of the outer bottle body (1).

5. The inner bag shrink bottle according to claim 1, characterized in that: The outer bottle body (1) is threadably connected to the vacuum pump (3).

6. The method for processing a shrink-in-line bottle as claimed in claim 1, characterized in that: The method comprises the following steps to prepare a multi-layer preform: using materials that are not soluble in each other at the joint as an inner bag material layer (5) and an outer bottle body material layer (6), positioning the inner bag material layer (5) on the inner side of the outer bottle body material layer (6), and extruding the inner bag material layer (5) with a die head to form a cylindrical multi-layer preform; Blow molding: the mold is closed, and the mold clamping edge is used to make the innermost layer of the inner bag material layer (5) fuse, and the blow molding nozzle is used to perform blow molding in the inner bag material layer (5). The outer bottle body material layer (6) is blocked by the inner bag material layer (5) and does not fuse with the inner bag material layer (5), forming a breathable gap (4) at the bottom of the outer bottle body (1); the mold is opened, and the burrs are cut off; the vacuum pump (3) is installed: the vacuum pump (3) is installed at the bottle mouth of the outer bottle body (1), and the vacuum pump (3) presses the open side of the inner bag (2) to fix it to the bottle mouth of the outer bottle body (1).

7. The method for processing a shrink-in-bag bottle as claimed in claim 6, characterized in that: The inner bag material layer (5) includes an outermost EVOH layer (7), and the outer bottle body material layer (6) is a HDPE layer (8) or a PP layer.

8. The method for processing a shrink-in-bag bottle as claimed in claim 7, characterized in that: The inner bag material layer (5) comprises, from the inside to the outside, an LDPE layer (9), an adhesive layer (10) and an EVOH layer (7).

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