CN111619178A - Coiled core tube and preparation method thereof - Google Patents

Abstract

The invention relates to a core tube and a preparation method thereof. The inner tube core is fixed by filling and adhering the inner tube sleeve made of EPE between the inner tube core and the outer tube core, and the overall production cost is low; According to the actual use requirements, adjusting the density of the EPE core material and the EPE surface material of the inner tube kit can change the parameter performance of the core tube. The inner tube core, outer tube core, and inner tube kit are prepared separately, and then bonded together by hot melt adhesive. You only need to set up different specifications of the inner tube core, the injection mold for the outer tube core, and the stamping die for the inner tube kit, respectively. Production and combination of core tubes of different specifications, the production equipment and injection molds are highly versatile, which is convenient for the preparation of products of different specifications and greatly reduces equipment investment. The sleeves in the tube are set at intervals, and the number of sleeves in the tube can be set according to the implementation requirements, which ensures the strength of the core tube and saves costs; and the setting position of the sleeve in the tube can be adjusted according to the length of the core tube, which is suitable for preparing products of any size.

Description

A kind of core tube and preparation method thereof

technical field

The present invention relates to the technical field of strips, and more particularly, to a core tube and a preparation method of the core tube.

Background technique

In the prior art, as shown in FIG. 1 , 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 common structure of the core tube is an integrated structure, which is extruded by an extruder, so the support structure is not broken along the length of the core tube, and the material cost during preparation is high; if it is necessary to place the support structure on the core tube. If there is a disconnection in the length direction of the machine, another extrusion equipment needs to be set up, the equipment investment is large, and the preparation cost is high.

On the other hand, each type of core tube, including different diameters of the inner and outer cores, different strengths between the inner and outer cores, etc., requires a specific set of injection molds corresponding to a type of core tube. 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

The purpose of the present invention is to overcome the deficiencies of the prior art, provide a core tube and a preparation method thereof, meet the requirements of low material cost, low preparation cost, universal injection mold, etc., and can reduce the production cost as a whole.

The technical scheme of the present invention is as follows:

A core tube comprises an inner tube core and an outer tube core, the inner tube core is arranged in the outer tube core, a plurality of inner tube sleeves are sleeved on the outer side of the inner tube core, and the inner tube sleeves are filled between the inner tube core and the outer tube core, The inner tube core is fixed in the outer tube core; the inner tube kit includes an EPE core material, 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, and the hardness of the EPE surface material is Greater than the hardness of EPE core material.

Preferably, the density of the EPE face material is 100kg/m ³ -110kg/m ³ , and the density of the EPE core material is 25kg/m ³ -28kg/m ³ .

Preferably, between the EPE surface material and the EPE core material, between the outer side of the inner tube core and the inner side wall of the inner tube sleeve, and between the inner side of the outer tube core and the outer roll surface of the inner tube sleeve, hot melt adhesive is used to bond and fix.

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

Preferably, several inner tube sleeves are sleeved on the outer side of the inner tube core at intervals.

Preferably, at least three in-tube sleeves are included, at least one in-tube sleeve is provided at both ends of the inner or outer tube core, and at least one in-tube sleeve is installed in the middle of the inner and outer tube cores.

Preferably, the EPE face material and the EPE core material are made of HDPE foam.

Preferably, the inner tube sleeve is a ring structure, and the inner tube core and the outer tube core are coaxially fixed.

A preparation method of a core tube, comprising the steps:

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

2) Set the inner tube kit on the outside of the inner tube core;

3) Coat the outer surface of the inner sleeve with hot melt adhesive;

4) Set the outer tube core on the outer surface of the inner tube sleeve, and fix it with hot melt adhesive.

Preferably, the preparation method of the inner tube kit is as follows: firstly 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 of the EPE core material and the first surface of the EPE core material. Two surfaces; and 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 kit.

The beneficial effects of the present invention are as follows:

In the core tube of the present invention, the inner tube set made of EPE is filled and bonded between the inner tube core and the outer tube core, and the inner tube core is fixed, and the overall production cost is low; and it can be used according to actual needs. , Adjust the density of the EPE core material and the EPE surface material of the inner tube kit to change the parameter performance of the core tube. Based on the structure of the present invention, it is only necessary to set up different specifications of the inner tube core, the injection mold of the outer tube core, and the stamping die of the inner tube set, respectively, and then the core tubes of different specifications can be produced and combined respectively, and the versatility of the mold is greatly improved. .

The sleeves in the tube are set at intervals, and the number of sleeves in the tube can be set according to the implementation requirements, which ensures the strength of the core tube and saves costs; and the setting position of the sleeve in the tube can be adjusted according to the length of the core tube, which is suitable for preparing products of any size.

In the preparation method of the core tube of the present invention, the inner tube core, the outer tube core and the inner tube sleeve are prepared separately, and then bonded together by hot melt adhesive, the production equipment and the injection mold are highly versatile, and it is convenient to prepare products of different specifications , greatly reducing equipment investment.

Description of drawings

1 is a schematic cross-sectional view of a core tube in the prior art;

Fig. 2 is the structural representation of core tube;

Figure 3 is a cross-sectional view of the core tube;

Fig. 4 is the structural representation of the in-pipe kit;

Figure 5 is an exploded view of the structure of the in-pipe kit;

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 ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

In order to solve the problems of high production cost, high mold cost and uncommon specifications existing in the prior art, the present invention provides a core tube, as shown in FIG. 2 and FIG. 3 , including 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 number of inner tube fittings 20 are sleeved on the outside 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 on the outer tube core within 10. In this embodiment, the inner pipe member 20 has a ring structure, and the inner tube core 11 and the outer tube core 10 are coaxially fixed.

As shown in FIG. 4 and FIG. 5 , 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 disposed on the first surface and the second surface of the EPE core material 21 , Form a sandwich structure. The hardness of the EPE face material 22 is greater than the hardness of the EPE core material 21 . In the present invention, the hardness of the EPE surface material 22 is greater than that of the EPE core material 21 , which can reduce the material cost of the inner pipe fitting 20 while ensuring the strength of the inner pipe fitting 20 . 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 are the same, if the hardness is too low, the strength of the inner pipe fitting 20 cannot meet the implementation requirements. , the cost is higher.

In this embodiment, the EPE surface material 22 and the EPE core material 21 are made of HDPE foam, that is, the EPE pearl cotton (polyethylene foam cotton) made of high-density polyethylene HDPE foam, corresponding to the EPE core material 21 and the EPE core material 21. The hardness of the EPE surface material 22 is controlled by the foaming ratio. The smaller the foaming ratio, the higher the density of the EPE and the higher the hardness; otherwise, the lower the hardness. In the present invention, the density of the EPE face material 22 is 100kg/m ³ -110kg/m ³ , the density of the EPE core material 21 is 25kg/m ³ -28kg/m ³ , in this embodiment, the density of the EPE face material 22 is 100kg/m ³ , the density of the EPE core material 21 is 25kg/m ³ , and the cost can be reduced as much as possible under the condition that the inner pipe fitting 20 obtains sufficient strength.

The present invention adopts the method of hot melt adhesive bonding, specifically, between the EPE surface material 22 and the EPE core material 21 , between 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 It is fixed with hot melt glue with the outer surface of the inner tube 20 . Among them, a high temperature resistant hot melt adhesive is selected to meet the requirements of a 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 through functional hot melt adhesive can be completed only by controlling the temperature, which is convenient and efficient.

In order to balance cost and performance, in this embodiment, a plurality of inner tube parts 20 are sleeved on the outer side of the inner tube core 11 at intervals. Specifically, it includes at least three inner tube fittings 20 , at least one inner tube fitting 20 is respectively provided 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 . During specific implementation, the number and interval of the inner pipe fittings 20 may also be increased according to requirements, and the interval between the inner pipe fittings 20 may be unequal.

The present invention also provides a method for preparing a core tube, wherein the inner tube core 11, the outer tube core 10, and the inner tube fitting 20 are prepared separately, and then combined into a whole, which specifically includes the following steps:

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

2) The inner pipe fitting 20 is sleeved on the outer side of the inner pipe core 11;

3) Coating hot melt adhesive on the outer surface of the inner pipe fitting 20;

4) The outer tube core 10 is sleeved on the outer coil surface of the inner tube fitting 20, and fixed by hot melt adhesive.

Wherein, the preparation method of the inner pipe fitting 20 is as follows: firstly, a sandwich sheet is prepared, and the sandwich sheet 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 part of the EPE core material 21 . One surface and the second surface; 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 the through hole that fits the inner tube core 11 , and the outer contour of the inner tube fitting 20 is adapted to the outer tube core 10 .

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention. As long as it is in accordance with the technical essence of the present invention, changes, modifications, etc. to the above-described embodiments will fall within the scope of the claims of the present invention.

Claims (10)

1. a core tube, is characterized in that, comprises inner tube core, outer tube core, inner tube core is arranged in outer tube core, and the outside of inner tube core is sleeved with some inner tube kits, and inner tube kits are filled in inner tube core and outer tube core. Between the outer tube cores, the inner tube core is fixed in the outer tube core; the inner tube kit 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 , the hardness of the EPE surface material is greater than that of the EPE core material. 2 . The core tube according to claim 1 , wherein the density of the EPE surface material is 100kg/m ³ -110kg/m ³ , and the density of the EPE core material is 25kg/m ³ -28kg/m ³ . 3. The core tube according to claim 1, characterized in that, between the EPE surface material and the EPE core material, between the outer side of the inner tube core and the inner side wall of the inner tube sleeve, the inner side of the outer tube core and the inner side of the inner tube sleeve Between the outer roll surfaces, it is fixed by hot melt adhesive. 4 . The core tube according to claim 3 , wherein the softening temperature of the hot melt adhesive is greater than 100° C. 5 . 5 . The core tube according to claim 1 , wherein a plurality of inner tube sleeves are sleeved on the outer side of the inner tube core at intervals. 6 . 6. The core tube according to claim 5, characterized in that it comprises at least three inner tube sleeves, and at least one inner tube sleeve is respectively provided at both ends of the inner tube core or the outer tube core, and the middle part of the inner tube core and the outer tube core is provided with at least one inner tube sleeve respectively. The location is provided with at least one in-line kit. 7 . The core tube according to claim 1 , wherein the EPE surface material and the EPE core material are made of HDPE foam. 8 . 8 . The reel tube according to claim 1 , wherein the inner sleeve of the tube is a ring structure, and the inner tube core and the outer tube core are coaxially fixed. 9 . 9. the preparation method of the core tube described in any one of claim 1 to 8, is characterized in that, comprises the steps: 1) The outer surface of the inner tube core is coated with hot melt adhesive; 2) Set the inner tube sleeve on the outside of the inner tube core; 3) Coat the outer surface of the inner sleeve with hot melt adhesive; 4) Set the outer tube core on the outer surface of the inner tube sleeve, and fix it with hot melt adhesive. 10. The preparation method of the core tube according to claim 9, wherein the preparation method of the inner sleeve is as follows: firstly prepare a sandwich sheet, and the sandwich sheet comprises an EPE core material and two EPE face materials, Two pieces of EPE surface material are respectively arranged on the first surface and the second surface of the EPE core material; and then the sandwich sheet is punched corresponding to the outer diameter of the inner tube core and the inner diameter of the outer tube core to obtain the inner tube kit.

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