A core tube and its preparation method

Abstract

The present invention relates to a coiled core tube and a preparation method thereof. The inner core tube is fixed by filling and bonding an inner tube sleeve made of EPE between an inner tube core and an outer tube core, and the overall production cost is low. The density of the EPE core material and the EPE surface material of the inner tube sleeve can be adjusted according to actual use requirements, so as to change the parameter performance of the coiled core tube. The inner tube core, the outer tube core, and the inner tube sleeve are prepared separately, and then bonded together by hot melt adhesive. It is only necessary to set injection molds of inner tube cores and outer tube cores of different specifications and stamping molds of the inner tube sleeve to produce and combine them into coiled core tubes of different specifications. The production equipment and the injection molds are highly versatile, which is convenient for preparing products of different specifications and greatly reduces the equipment investment. The inner tube sleeves are arranged at intervals, and the number of the inner tube sleeves can be set according to the implementation requirements, which ensures the strength of the coiled core tube while saving costs. In addition, the setting position of the inner tube sleeve can be adjusted according to the length of the coiled core tube, which is suitable for preparing products of any size.

Description

Technical Field

[0001] The present invention relates to the technical field of strip materials, and more particularly to a core-rolled tube and a method for preparing the core-rolled tube. Background Art

[0002] In the prior art, such as Figure 1 As shown, the core tube is made by ABS injection molding, wherein the inner tube core and the outer tube core are connected and supported by a support structure. The core tube of the common structure is an integrated structure, which is extruded by an extruder, so the support structure is not disconnected along the length direction of the core tube, and the material cost during preparation is high; if the support structure needs to be disconnected in the length direction of the core tube, another extrusion device needs to be set up, which requires a large equipment investment and a high preparation cost.

[0003] On the other hand, each specification of the winding tube, including the different diameters of the inner and outer tube cores, the different strengths between the inner and outer tube cores, etc., requires a specific injection mold corresponding to a specification of the winding tube, and the mold cost is extremely high; moreover, injection molds of various specifications cannot be shared, and the overall production cost cannot be further reduced. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a core-rolled tube and a preparation method thereof, which meet the requirements of low material cost, low preparation cost, and universal injection molds, and can reduce the production cost as a whole.

[0005] The technical solution of the present invention is as follows:

[0006] A rolled core tube comprises an inner tube core and an outer tube core, wherein the inner tube core is arranged in the outer tube core, a plurality of inner tube sets are sleeved on the outer side of the inner tube core, the inner tube sets are filled between the inner tube core and the outer tube core, and the inner tube core is fixed in the outer tube core; the inner tube sets comprise an EPE core material and two pieces of EPE surface materials, wherein the two pieces of EPE surface materials are respectively arranged on the first surface and the second surface of the EPE core material, and the hardness of the EPE surface material is greater than the hardness of the EPE core material.

[0007] As a preferred embodiment, the density of the EPE surface material is 100 kg / m 3 -110kg / m 3 , the density of EPE core material is 25kg / m 3 -28kg / m 3 .

[0008] Preferably, the EPE surface material and the EPE core material, the outer side of the inner tube core and the inner side wall of the inner tube sleeve, and the inner side of the outer tube core and the outer rolled surface of the inner tube sleeve are fixed by hot melt adhesive.

[0009] Preferably, the softening temperature of the hot melt adhesive is greater than 100°C.

[0010] Preferably, a plurality of inner tube sleeves are sleeved on the outer side of the inner tube core at intervals.

[0011] Preferably, at least three inner tube sets are included, at least one inner tube set is respectively arranged at both ends of the inner tube core or the outer tube core, and at least one inner tube set is arranged in the middle position of the inner tube core and the outer tube core.

[0012] Preferably, the EPE surface material and the EPE core material are made of HDPE foaming.

[0013] Preferably, the inner tube set is a circular ring structure, and the inner tube core is coaxially fixed with the outer tube core.

[0014] A method for preparing a core tube comprises the following steps:

[0015] 1) Apply hot melt adhesive to the outer surface of the inner tube core;

[0016] 2) Sleeve the inner tube sleeve on the outer side of the inner tube core;

[0017] 3) Apply hot melt adhesive to the outer surface of the inner tube sleeve;

[0018] 4) The outer tube core is placed on the outer rolled surface of the inner tube sleeve and fixed with hot melt adhesive.

[0019] Preferably, the preparation method of the in-tube set is: first prepare a sandwich sheet, the sandwich sheet comprising an EPE core material and two pieces of EPE surface materials, the two pieces of EPE surface materials are respectively arranged on the first surface and the second surface of the EPE core material; then punch the sandwich sheet corresponding to the outer diameter of the inner tube core and the inner diameter of the outer tube core to obtain the in-tube set.

[0020] The beneficial effects of the present invention are as follows:

[0021] The core-wound tube of the present invention is fixed by filling and bonding the inner tube core made of EPE between the inner tube core and the outer tube core, and the overall production cost is low; and the density of the EPE core material and the EPE surface material of the inner tube core can be adjusted according to actual use requirements to change the parameter performance of the core-wound tube. Based on the structure of the present invention, it is only necessary to set up injection molds of inner tube cores and outer tube cores of different specifications and stamping molds of the inner tube core to produce and combine core-wound tubes of different specifications respectively, and the versatility of the mold is greatly improved.

[0022] The interval setting of the in-tube sets can set the number of in-tube sets according to the implementation requirements, which ensures the strength of the coiled tube while saving costs; and the setting position of the in-tube sets can be adjusted according to the length of the coiled tube, which is suitable for preparing products of any size.

[0023] In the method for preparing the core-rolled tube described in the present invention, the inner tube core, the outer tube core and the inner tube set are prepared separately and then bonded together by hot-melt adhesive. The production equipment and the injection mold have strong versatility, which is convenient for preparing products of different specifications and greatly reduces equipment investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional schematic diagram of a coiled core tube of the prior art;

[0025] Figure 2 It is a structural schematic diagram of a coiled core tube;

[0026] Figure 3 is a cross-sectional view of a rolled core tube;

[0027] Figure 4 is a schematic diagram of the structure of the in-tube kit;

[0028] Figure 5 It is the structural exploded diagram of the in-tube kit;

[0029] In the figure: 10 is the outer tube core, 11 is the inner tube core, 20 is the inner tube set, 21 is the EPE core material, and 22 is the EPE surface material. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] In order to solve the problems of high production cost, high mold cost and non-universal specifications in the prior art, the present invention provides a core tube, such as Figure 2 , Figure 3 As shown, it includes an inner tube core 11 and an outer tube core 10, the inner tube core 11 is arranged in the outer tube core 10, a plurality of inner tube fittings 20 are sleeved on the outer side of the inner tube core 11, the inner tube fittings 20 are filled between the inner tube core 11 and the outer tube core 10, and the inner tube core 11 is fixed in the outer tube core 10. In this embodiment, the inner tube fittings 20 are annular structures, and the inner tube core 11 and the outer tube core 10 are coaxially fixed.

[0032] like Figure 4 , Figure 5As shown, the inner pipe fitting 20 includes an EPE core material 21 and two pieces of EPE surface materials 22, and the two pieces of EPE surface materials 22 are respectively arranged on the first surface and the second surface of the EPE core material 21 to form a sandwich structure. The hardness of the EPE surface material 22 is greater than the hardness of the EPE core material 21. In the present invention, the EPE surface material 22 is greater than the EPE core material 21 in hardness, and while ensuring the strength of the inner pipe fitting 20, the material cost of the inner pipe fitting 20 can be reduced. If the inner pipe fitting 20 is made of a single material, that is, the hardness of the EPE core material 21 and the EPE surface material 22 is the same, if the hardness is too low, the strength of the inner pipe fitting 20 cannot meet the implementation requirements. If the hardness is increased to the strength of the inner pipe fitting 20 to meet the implementation requirements, the cost is high.

[0033] In this embodiment, the EPE surface material 22 and the EPE core material 21 are made of HDPE foam, that is, EPE pearl cotton (polyethylene foam cotton) made of high-density polyethylene HDPE foam. The hardness of the EPE core material 21 and the EPE surface material 22 is controlled by the foaming multiple. The smaller the foaming multiple, the greater the EPE density and the higher the hardness; otherwise, the lower the hardness. In the present invention, the density of the EPE surface material 22 is 100kg / m 3 -110kg / m 3 , the density of EPE core material 21 is 25kg / m 3 -28kg / m 3 In this embodiment, the density of the EPE surface material 22 is 100 kg / m 3 , the density of EPE core material 21 is 25kg / m 3 , while ensuring that the pipe fittings 20 inside the pipe have sufficient strength, the cost is reduced as much as possible.

[0034] The present invention adopts hot melt adhesive bonding for assembly. Specifically, the EPE surface material 22 and the EPE core material 21, the outer side of the inner tube core 11 and the inner side wall of the inner tube fitting 20, and the inner side of the outer tube core 10 and the outer roll surface of the inner tube fitting 20 are fixed by hot melt adhesive bonding. Among them, a high temperature resistant hot melt adhesive is selected to meet the requirements of the high temperature working environment. In this embodiment, the softening temperature of the hot melt adhesive is greater than 100°C. Preferably, a functional hot melt adhesive with a softening temperature greater than 140°C can be selected. Bonding and assembly by functional hot melt adhesive can be completed by controlling the temperature, which is convenient and efficient.

[0035] In order to balance cost and performance, in this embodiment, a plurality of inner tube fittings 20 are sleeved at intervals on the outside of the inner tube core 11. Specifically, at least three inner tube fittings 20 are included, at least one inner tube fitting 20 is respectively arranged at both ends of the inner tube core 11 or the outer tube core 10, and at least one inner tube fitting 20 is arranged in the middle of the inner tube core 11 and the outer tube core 10. In specific implementation, the number and interval of the inner tube fittings 20 can also be increased according to demand, and the intervals of the inner tube fittings 20 can be unequal.

[0036] The present invention also provides a method for preparing a core-rolled tube, wherein an inner tube core 11, an outer tube core 10, and an inner tube member 20 are prepared separately and then combined into one, specifically comprising the following steps:

[0037] 1) The outer surface of the inner tube core 11 is coated with hot melt adhesive;

[0038] 2) The inner tube fitting 20 is sleeved on the outer side of the inner tube core 11;

[0039] 3) Apply hot melt adhesive to the outer rolled surface of the inner pipe fitting 20;

[0040] 4) The outer tube core 10 is sleeved on the outer rolled surface of the inner tube fitting 20 and fixed by hot melt adhesive.

[0041] The preparation method of the inner tube fitting 20 is as follows: firstly prepare a sandwich sheet, wherein the sandwich sheet comprises an EPE core material 21 and two EPE surface materials 22, wherein the two EPE surface materials 22 are respectively arranged on the first surface and the second surface of the EPE core material 21; and then punch the sandwich sheet corresponding to the outer diameter of the inner tube core 11 and the inner diameter of the outer tube core 10 to obtain the inner tube fitting 20. The center position of the punched inner tube fitting 20 is a through hole adapted to the inner tube core 11, and the outer contour of the inner tube fitting 20 is adapted to the outer tube core 10.

[0042] The above embodiments are only used to illustrate the present invention, and are not used to limit the present invention. As long as they are based on the technical essence of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A core tube, characterized in that: The invention comprises an inner tube core and an outer tube core, wherein the inner tube core is arranged in the outer tube core, a plurality of inner tube sets are sleeved on the outer side of the inner tube core, the inner tube sets are filled between the inner tube core and the outer tube core, and the inner tube core is fixed in the outer tube core; the inner tube set comprises an EPE core material and two pieces of EPE surface materials, wherein the two pieces of EPE surface materials are respectively arranged on the first surface and the second surface of the EPE core material, the hardness of the EPE surface material is greater than the hardness of the EPE core material, and the density of the EPE surface material is 100kg / m 3 - 110kg / m 3 , the density of EPE core material is 25kg / m 3 - 28kg / m 3 The EPE surface material and the EPE core material, the outer side of the inner tube core and the inner side wall of the inner tube sleeve, and the inner side of the outer tube core and the outer rolled surface of the inner tube sleeve are fixed by hot melt adhesive. Several inner tube sleeves are sleeved on the outer side of the inner tube core at intervals, including at least three inner tube sleeves. At least one inner tube sleeve is respectively arranged at both ends of the inner tube core or the outer tube core, and at least one inner tube sleeve is arranged in the middle of the inner tube core and the outer tube core. The inner tube sleeve is obtained by the following preparation method: first prepare a sandwich sheet, the sandwich sheet includes an EPE core material and two pieces of EPE surface materials, and the two pieces of EPE surface materials are respectively arranged on the first surface and the second surface of the EPE core material; then punch the sandwich sheet corresponding to the outer diameter of the inner tube core and the inner diameter of the outer tube core to obtain the inner tube sleeve.

2. The core-rolled tube according to claim 1, characterized in that: The softening temperature of hot melt adhesive is greater than 100°C.

3. The core-wound tube according to claim 1, characterized in that: EPE surface material and EPE core material are made of HDPE foam.

4. The core-wound tube according to any one of claims 1 to 3, characterized in that: The inner tube set is a circular ring structure, and the inner tube core and the outer tube core are coaxially fixed.

5. A method for preparing a core-rolled tube according to any one of claims 1 to 4, characterized in that: The steps include: 1) Apply hot melt adhesive on the outer surface of the inner tube core; 2) Sleeve the inner tube sleeve onto the outer side of the inner tube core; 3) Apply hot melt adhesive to the outer surface of the inner tube sleeve; 4) Place the outer tube core on the outer rolled surface of the inner tube sleeve and fix it with hot melt adhesive.

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