CN115366304A - Hot melt adhesive filling method and filling device - Google Patents

Abstract

The invention belongs to the technical field of polymer material processing, and in particular relates to a hot melt adhesive filling method and a filling device. When filling, preheat the rubber hose first so that the rubber hose is heated and expanded first, so as to ensure that the viscosity of the hot melt adhesive will not increase due to cooling and cooling during filling, and the pre-heated rubber hose will expand when heated, and there will be a greater increase in the subsequent cooling. Shrinkage to match the cooling shrinkage of the hot melt adhesive to prevent the hot melt adhesive from detaching from the hose due to excessive shrinkage. Uniform cooling can reduce the volume shrinkage of the hot melt adhesive during the cooling process, further reducing the risk of detachment; improving the production of hot melt adhesive Yield, reduce production cost, reduce transportation and storage conditions.

Description

A hot melt adhesive filling method and filling device

technical field

The invention belongs to the technical field of polymer material processing, and in particular relates to a hot melt adhesive filling method and a filling device.

Background technique

Due to the addition of too many crystalline components and thermoplastic components to traditional high-strength hot-melt adhesives to improve the initial adhesion, the introduction of these components will increase the overall Tg of the hot-melt adhesive, which can easily cause wall detachment during filling , weakening the internal stress generated when the high Tg component undergoes glass transition temperature during rapid cooling can reduce the occurrence of detachment. The existing technology puts the filled hot melt adhesive in the insulation cavity, uses the heat release of the hot melt adhesive itself to increase the ambient temperature in the cavity, and cooperates with the insulation structure to reduce the cooling rate of the environment. At the same time, the insulation cavity is placed at a constant temperature The box further delays the decline of the ambient temperature. This type of process has the following problems: the temperature of different positions in the insulation chamber is inconsistent, the hot melt adhesive at the center of the interior receives the heat radiation from the surroundings, and the edge position can only receive the heat from the inside to the outside. The heat radiation, the overall temperature in the center is high, the surrounding temperature is low, the temperature decreases from the inside to the outside, and the external cooling speed is too fast and easy to fall off the wall; through thermal radiation + heat preservation cavity + constant temperature environment to delay the cooling of the system, the consumed The time is too long, usually 1 to 2 days, which takes a long time and the production efficiency is low; long-term heat radiation will cause the aging of the heat-resistant components of the hot melt adhesive, and accelerate the reaction of the reactive components, affecting the thermal properties of the melt.

Contents of the invention

In view of this, the present invention proposes a hot-melt adhesive filling method and a filling device. When filling, the rubber hose is preheated first so that the rubber hose is heated and expanded first, so as to ensure that the hot-melt adhesive will not cause viscosity loss due to cooling and cooling during filling. Larger, and the pre-heated rubber hose will expand when heated, and will have a greater shrinkage rate during subsequent cooling to match the cooling shrinkage of the hot melt adhesive to prevent the hot melt adhesive from detaching from the hose due to excessive shrinkage. Uniform cooling can reduce the hot melt adhesive. The volume shrinks during the cooling process, which further reduces the risk of detachment; improves the production yield of hot melt adhesives, reduces production costs, and reduces transportation and storage conditions.

In order to realize above-mentioned technical purpose, the concrete technical scheme that the present invention adopts is:

A hot melt adhesive filling method, comprising the following steps:

S101: preheating the hose used for filling the hot melt adhesive;

S102: filling hot melt adhesive into the preheated rubber tube;

S103: Temporarily insulate the rubber hose filled with hot melt adhesive;

S104: Repeat S101-S103 to continue filling and insulate the next rubber hose until the filled and insulated rubber hose reaches the target quantity;

S105: After the target quantity of rubber hoses are filled, put each of the rubber hoses in the temporary heat preservation into the cooling device to cool down to room temperature at a uniform speed.

Further, the preheating temperature of the rubber tube is higher than the temperature of the hot melt adhesive before filling.

Further, the preheating temperature of the rubber hose is 5-10° C. higher than the temperature of the hot melt adhesive before filling.

Further, the temperature of the hot melt adhesive before filling is 80-150°C.

Further, the cooling rate of the rubber hose to room temperature at a uniform speed is 10-20° C./Hour.

Further, the cooling device is an oven.

The present invention also proposes a hot melt adhesive filling device for completing the above hot melt adhesive filling method, comprising:

bracket;

A plurality of heating insulation sleeves are all installed on the bracket, and a rubber tube cavity is opened, and a glue inlet is opened at the bottom of the rubber tube cavity;

The filling device is used for filling the hot melt adhesive into the glue tube in the glue tube cavity based on the glue inlet.

Each of the heating insulation jackets is rotatably mounted on the bracket.

Further, the filling device includes a glue feeding channel and an opening and closing valve; the outside of the glue feeding channel is provided with a heat preservation device; the opening and closing valve is used to open and close the glue feeding channel.

Further, when the rubber tube is in the cavity of the rubber tube, the distance between the side of the rubber tube and the heating insulation jacket is 1-2 mm.

By adopting the above technical solution, the present invention can also bring the following beneficial effects:

The temperature of the rubber hose in the present invention is slightly higher than the temperature of the hot melt adhesive, which further reduces the viscosity of the hot melt adhesive in contact with the rubber hose and improves the fluidity of the hot melt adhesive;

The invention adopts the technical means of batch filling and batch cooling, which can reduce production cost and save production time.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the schematic flow sheet of hot melt adhesive filling method in the specific embodiment of the present invention;

Fig. 2 is the structural representation of hot-melt glue filling device in the specific embodiment of the present invention;

Among them: 1. Adhesive flow channel; 2. Opening and closing valve; 3. Heating insulation cover; 4. Rubber hose; 5. Bracket; 6. Photoelectric sensor; 7. Rubber hose cavity.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It is noted that the following describes various aspects of the embodiments that are within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is illustrative only. Based on the present disclosure, a person skilled in the art should appreciate that an aspect described herein may be implemented independently of any other aspect and that two or more of these aspects may be combined in various ways. For example, any number of the aspects set forth herein can be used to implement an apparatus and/or practice a method. In addition, such an apparatus may be implemented and/or such a method practiced using other structure and/or functionality than one or more of the aspects set forth herein.

It should also be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

Additionally, in the following description, specific details are provided to facilitate a thorough understanding of examples. However, it will be understood by those skilled in the art that the described aspects may be practiced without these specific details.

In one embodiment of the present invention, propose a kind of hot melt adhesive filling method, as shown in Figure 1, comprise the following steps:

S101: preheating the rubber hose 4 used for filling hot melt adhesive;

S102: filling hot melt adhesive into the preheated rubber tube 4;

S103: Temporarily insulate the hose 4 filled with hot melt adhesive;

S104: Repeat S101-S103 to continue filling and insulated the next rubber hose 4 until the filled and insulated rubber hose 4 reaches the target quantity;

S105: After the target quantity of rubber hoses 4 are filled, put the rubber hoses 4 in the temporary heat preservation into the cooling device to cool down to room temperature at a uniform speed.

In this embodiment, the preheating device adopts a heating platen or other heating devices; the temporary heat preservation device is a device that can preheat and/or heat and can accommodate the rubber hose 4, including multiple groups. When the target quantity of rubber hoses 4 are filled and kept warm, they are put into the cooling equipment together. The cooling equipment adopts heatable equipment, and it is necessary to ensure that the corresponding cooling speed can be set for all rubber hoses 4 .

In this embodiment, the preheating temperature of the rubber tube 4 is higher than the temperature of the hot melt adhesive before filling.

In this embodiment, the preheating temperature of the rubber tube 4 is 5-10° C. higher than the temperature of the hot melt adhesive before filling.

In this embodiment, the temperature of the hot melt adhesive before filling is 80-150°C. When the hot melt adhesive is PUR hot melt adhesive, the temperature before filling is set to 80-100°C.

In this embodiment, the cooling rate of the rubber tube 4 to room temperature is 10-20° C./Hour.

In this embodiment, the cooling device is an oven.

In this embodiment, the rubber hose 4 is preheated before filling (the preheating temperature is 5-10°C higher than the heating temperature of the hot-melt adhesive), so that the rubber hose 4 is first heated and expanded, and the high-temperature hot-melt adhesive (80-150°C, non-reactive Type hot melt adhesive can control the temperature at 100-150°C according to the specific formula, and PUR hot-melt adhesive can be controlled at 80-100°C) when injecting the rubber tube 4 from bottom to top through the rubber nozzle of the rubber tube 4, the viscosity will not increase due to cooling and cooling ——The wettability of the tube wall becomes worse, and at the same time, because the temperature of the rubber tube 4 is slightly higher than the temperature of the hot melt adhesive, the viscosity of the hot melt adhesive in contact with the rubber tube 4 is further reduced, the fluidity of the hot melt adhesive is improved, and the hot melt adhesive is improved. For the infiltration of the tube wall of the rubber tube 4, place the filled hot melt adhesive in insulation materials such as asbestos, airgel, and high-temperature-resistant foam to keep warm. After a batch of filling is completed, transfer the rubber tube 4 to the test tube rack and place Put it into a high-temperature (80-150°C) oven to cool down at a constant speed (cool down at a rate of 10-20°C/Hour, and cool down to 25°C. PUR hot-melt adhesives require a low-humidity environment). The pre-heated hose 4 can improve the resistance of hot-melt adhesives The wettability of the tube wall (hot melt adhesive has low viscosity at high temperature, good fluidity, and good wettability) is more important. The pre-heated rubber tube 4 will expand when heated, and will have a greater shrinkage rate to match the heat when the temperature is subsequently lowered. The cooling shrinkage of the melt glue prevents the hot melt glue from being separated from the rubber tube 4 due to excessive shrinkage--the rubber tube 4 will always be in close contact with the hot melt adhesive during the cooling process (the shrinkage of the rubber tube 4 after thermal expansion is much greater than that of the hot melt adhesive from the liquid. Cooling to paste or semi-solid shrinkage), uniform cooling can reduce the volume shrinkage of the hot melt adhesive during the cooling process, and further reduce the risk of tube detachment, and there is no detachment phenomenon when stored at -10°C, and the cooling time is basically Within 10-15 hours, the production yield of the hot melt adhesive is improved, the production cost is reduced, and the transportation and storage conditions are reduced.

In one embodiment, based on the same inventive concept, the present invention proposes a hot melt adhesive filling device for completing the above hot melt adhesive filling method, including:

Bracket 5;

A plurality of heating insulation sleeves 3 are all installed on the bracket 5, and a rubber tube cavity 7 is provided, and the bottom of the rubber tube cavity 7 is provided with a glue inlet;

The filling device is used for filling hot melt glue into the glue tube 4 in the glue tube chamber 7 based on the glue inlet.

In this embodiment, each heating and heat preservation jacket 3 is rotatably mounted on the bracket 5 .

In this embodiment, when the rubber hose 4 is in the rubber hose cavity 7, the distance between the side of the rubber hose 4 and the heating and heat preservation jacket 3 is 1-2 mm.

In this embodiment, the filling device includes a glue feeding channel 1 and an opening and closing valve 2; an insulation device is provided outside the glue feeding channel 1;

In one embodiment, the end of the glue inlet flow channel 1 is provided with threads, and the bottom of the rubber tube 4 can be connected to the end of the glue flow channel 1 based on the threads so as to realize hot melt glue filling isolated from the external environment. The glue feeding channel of this embodiment is based on a base and is fixed at the position that each heating insulation jacket 3 can reach after rotation, and each rubber hose 4 can be fixed on the base based on threads to realize filling one by one after arriving.

In this embodiment, the thread setting method at the end of the glue inlet flow channel 1 can be directly provided with threads at the end of the glue inlet flow channel 1 .

Example 1: The produced non-reactive hot-melt adhesive is hot-melted with a pressure plate at 130°C and then pumped into the filling device through a pipeline. First, 1-2kg of hot-melt adhesive is used to clean the filling flow channel, and the glue inlet flow is included After cleaning all the channels of channel 1, put the rubber hose 4 into the heating insulation jacket 3 that has been heated to 140°C, screw the glue nozzle part and the rubber outlet of the pipeline tightly, and align the photoelectric sensor 6 with the specified position of the rubber hose 4 - identify the rubber hose 4, the amount of glue poured, glue poured, the liquid level of the hot melt glue is higher than the heating protection range of the heating insulation cover 3, the photoelectric sensor 6 recognizes the position of the liquid level, stops the glue pouring, quickly takes out the rubber tube 4 and seals the plug with core and Put the tail plug into the insulation chamber, transfer it to the test tube rack after a batch of filling is completed and put it into the oven heated to 130°C, set the cooling rate of 15°C/Hour, take it out and pack it after cooling to 25°C it is good.

Example 2: The produced PUR hot-melt adhesive is hot-melted with a pressure plate at 90°C and pumped through the pipeline to the filling device in the vacuum glove box. First, clean the filling flow channel with 1-2kg of hot-melt adhesive. After cleaning all the flow channels of the glue inlet channel 1, put the rubber hose 4 into the heating insulation sleeve 3 heated to 110°C, screw the glue nozzle part and the glue outlet of the pipeline tightly, and align the photoelectric sensor 6 with the specified position of the rubber hose 4 -Identify the amount of glue filled in the rubber tube 4, when the glue is poured, the liquid level of the hot melt glue is higher than the heating protection range of the heating insulation cover 3, the photoelectric sensor 6 recognizes the position of the liquid level, stops the glue filling, quickly takes out the rubber tube 4 and seals the head with core Put the plug and tail plug into the insulation chamber, transfer to the test tube rack after a batch of filling is completed and put it into a vacuum drying oven heated to 90°C, set the cooling rate of 10°C/Hour and turn on the vacuum drying , after cooling to 25°C, take it out and pack it well.

Table 1 is the test result of hot melt adhesive filling using the above two embodiments and other comparative examples:

Table 1

The technological difference of embodiment and comparative example:

The difference between embodiment 1 and comparative example 1-2 is that comparative example 1-2 adopts the filling process of not preheating rubber hose 4, only keeping warm and cooling at a uniform speed;

The difference between embodiment 1 and comparative examples 1-3 is that comparative examples 1-3 adopts preheating rubber hose 4, and the insulation cavity is kept warm;

The difference between embodiment 2 and comparative example 2-2 is that comparative example 2-2 adopts the filling process of not preheating rubber hose 4, only keeping warm and cooling at a uniform speed;

The difference between embodiment 1 and comparative example 2-3 is that comparative example 2-3 adopts preheating rubber hose 4, and the insulation cavity is kept warm;

The test method adopted in above-mentioned embodiment and comparative example is as follows:

(1) Adhesive strength test

Test method: Heat the heating sleeve of the hot melt adhesive dispenser to 120°C, put the hot melt adhesive into the heating sleeve and heat for 10-20 minutes to make it completely melt. Use the appropriate dispensing needle and dispensing path parameters to dispense glue on the substrate to be bonded, and then press it with another substrate to be bonded. The thickness of the laminate is controlled by Spacer (0.1mm-0.2mm), and finally use the universal The testing machine tested the bonding strength after 10 minutes.

Test results: The test results of the adhesive strength test are shown in Table 1. As can be seen from Table 1, the 10min initial strength of the hot-melt adhesive prepared by the present invention is greater than 1MPa. It can be seen that the hot-melt adhesive of the present invention is a qualified product and belongs to the hot-melt adhesive with high initial strength.

(1) Detachment rate test

Test method: Seal the hot melt adhesive in an aluminum foil bag, store at 0°C for 30 days and -10°C for 3 days, tear off the aluminum foil bag, observe and count the number of hot melt adhesives with detachment, and calculate the detachment rate. The calculation method is: the number of hot melt adhesives with wall separation/total number*100%.

Test results: By preheating the hose 4, the process of cooling at a uniform speed can greatly reduce the wall-off rate of the hot melt adhesive with high initial strength, and the single use of one of the processes cannot achieve the synergistic effect of the two. It can be seen that the filling process of the present invention is stable and can meet the requirement of high initial strength hot melt adhesive not to fall off the wall.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. The hot melt adhesive filling method is characterized by comprising the following steps:

s101: preheating a rubber tube for filling the hot melt adhesive;

s102: filling hot melt adhesive into the preheated rubber tube;

s103: temporarily preserving the heat of the rubber tube filled with the hot melt adhesive;

s104: repeating S101-S103 to continuously fill and insulate the next rubber tube until the filled and insulated rubber tubes reach the target number;

s105: and after the filling of the rubber tubes with the target quantity is finished, placing each rubber tube in the temporary heat preservation into a cooling device, and cooling to room temperature at a constant speed.

2. The hot melt adhesive filling method according to claim 1, wherein the preheating temperature of the hose is higher than the temperature of the hot melt adhesive before filling.

3. The hot melt adhesive filling method according to claim 2, wherein the preheating temperature of the rubber tube is 5-10 ℃ higher than the temperature of the hot melt adhesive before filling.

4. The hot melt adhesive filling method according to claim 1, wherein the temperature of the hot melt adhesive before filling is 80-150 ℃.

5. The hot melt adhesive filling method according to claim 4, wherein the cooling rate of the rubber tube for uniformly cooling to room temperature is 10-20 ℃/Hour.

6. The hot melt adhesive filling method according to claim 1, wherein the cooling device is an oven.

7. A hot melt adhesive filling apparatus for carrying out the hot melt adhesive filling method according to any one of claims 1 to 6, comprising:

a support;

the heating insulation sleeves are all arranged on the bracket and are provided with rubber tube cavities, and the bottoms of the rubber tube cavities are provided with rubber inlets;

and the filling device is used for filling the hot melt adhesive into the rubber tube in the rubber tube cavity based on the rubber inlet.

8. The hot melt adhesive filling apparatus according to claim 7, wherein each of said heated jackets is rotatably mounted on said frame.

9. The hot melt adhesive filling apparatus according to claim 7, wherein said filling apparatus comprises an adhesive inlet flow passage and an open-close valve; a heat preservation device is arranged outside the glue inlet flow passage; the opening and closing valve is used for opening and closing the glue inlet flow passage.

10. The hot melt adhesive filling apparatus according to claim 7, wherein when the rubber tube is positioned within the rubber tube cavity, the distance between the side surface of the rubber tube and the heating jacket is 1-2mm.

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