CN115609965B - A kind of hard foam processing technology - Google Patents

Abstract

The present invention is applicable to the technical field of hard foam processing, and provides a hard foam processing technology, comprising the following steps: grid cloths are respectively attached to the upper surface and the lower surface of a hard foam board; after the grid cloths are attached, a plurality of grooves are opened on the grid cloth on the upper surface of the hard foam board, and the depth of the grooves is less than the thickness of the hard foam board; after the grooves are opened, reinforcing material is poured on the grid cloth on the upper surface of the hard foam board, and the surface reinforcing material and the reinforcing material in the grooves form a whole. The hard foam processing technology provided by the present invention adds a cloth attaching process, grid cloths are attached to both the upper and lower surfaces of the board to form a sandwich structure similar to a "sandwich", the upper surface grid cloth is cut by opening shallow grooves and deep grooves, and then the reinforcing material is poured, and the shear strength and peel strength after actual pouring are significantly improved through the combination of the shallow grooves and deep grooves opened on the surface and the additional grid cloth.

Description

A kind of hard foam processing technology

Technical Field

The invention belongs to the technical field of hard foam processing, and in particular relates to a hard foam processing technology.

Background technique

Rigid foam plastics refer to foam plastics that have no flexibility, high compression hardness, can produce deformation when stress reaches a certain value, and cannot return to its original shape after stress is released. They are often used in related fields by taking advantage of their thermal insulation and mechanical properties. Representative products are polystyrene foam plastics, rigid polyurethane foam plastics, phenolic, amino, epoxy, thermosetting acrylic resin and other foam plastics, as well as rigid polyvinyl chloride foam plastics. They can be used as thermal insulation materials, interlayer materials, packaging materials, sound insulation and shockproof materials, building materials, etc.

Nowadays, customers' performance requirements are constantly increasing, and some performance data of rigid foam (such as peel strength) can no longer meet the needs. In addition, the existing process structure and processing methods are relatively simple, the optimization forms are relatively limited, and the competitiveness is insufficient.

Summary of the invention

The present invention provides a hard foam processing technology, aiming to solve the problems that customers' requirements for hard foam performance are constantly increasing, individual performance data of hard foam can no longer meet the demand, and the existing process structure and process processing method are relatively single.

The present invention is achieved in that a hard foam processing technology comprises the following steps:

Attach mesh cloths to the upper and lower surfaces of the rigid foam board respectively;

After the mesh cloth is pasted, multiple grooves are opened on the mesh cloth on the upper surface of the rigid foam board;

After the grooves are cut, the reinforcing material is poured onto the mesh cloth on the upper surface of the rigid foam board, and the surface reinforcing material and the reinforcing material in the groove form a whole.

Preferably, the groove includes a groove A and a groove B, and the depth of the groove A is smaller than the depth of the groove B.

Preferably, a plurality of grooves A and grooves B arranged in parallel and at intervals are provided along the length direction and the width direction of the rigid foam board.

Preferably, the grooves A and B in the same direction are arranged alternately in sequence.

Preferably, the ends of the groove A and the groove B are both open.

Compared with the prior art, the embodiments of the present application have the following beneficial effects:

The hard foam processing technology provided by the present invention adds a cloth pasting process, and grid cloth is pasted on both the upper and lower surfaces of the plate to form a sandwich structure similar to a "sandwich", and the upper surface grid cloth is cut by opening shallow grooves and deep grooves to destroy the continuity of the upper surface grid cloth, so that the grid cloth is only attached to the hard foam on the upper surface, and the force on the original whole surface of the whole grid cloth is transformed into the force on the surface of multiple small square blocks after the grid cloth is cut, which disperses the pulling force during peeling and increases the peeling strength. However, the lower surface grid cloth still plays a role in preventing scattering after the deep grooves are opened and the blocks are broken. Then, the reinforcing material is poured. After pouring, since the grid cloth is cut during grooving, the surface reinforcing material and the reinforcing material in the shallow grooves and deep grooves form a whole. During shear or peeling tests, a reaction force generated by extrusion confrontation opposite to the force will be formed in the shallow grooves and deep grooves, which increases the force during shear or peeling, thereby improving the process performance of the material after pouring, meeting the performance requirements of customers, and expanding the product width and breadth by optimizing the process structure of the hard foam, and improving the processing capacity of different process products by optimizing the process processing method.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the external structure of a hard foam processing process embodiment 1 provided by the present invention;

FIG2 is a schematic diagram of the internal structure of a hard foam processing process embodiment 1 provided by the present invention;

FIG3 is a flow chart of a hard foam processing process embodiment 1 provided by the present invention;

FIG4 is a conventional design diagram in the prior art;

FIG5 is a design diagram of adding mesh and adding shallow grooves in the experimental scheme;

Figure 6 is a design diagram of the shallow groove + patch (the whole mesh is not interrupted) in the experimental scheme;

FIG7 is a design diagram of shallow groove + patching (slotting to cut the mesh after patching) in the experimental scheme;

FIG8 is a bar graph showing the effect of mesh on peel strength in the experimental scheme;

FIG. 9 is a schematic structural diagram of a second embodiment of a hard foam processing process provided by the present invention.

Notes on the accompanying drawings: 1. Rigid foam board; 2. Mesh cloth; 3. Reinforcement material; 4. Groove A; 5. Groove B; 6. Groove C.

Detailed ways

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

Example 1

The embodiment of the present invention provides a hard foam processing technology, as shown in FIG1-FIG3, comprising the following steps:

The mesh cloth 2 is respectively attached to the upper surface and the lower surface of the rigid foam board 1, and the mesh cloth 2 is attached by glue to form a sandwich structure similar to a "sandwich";

After the mesh cloth 2 is attached, a plurality of grooves are opened on the mesh cloth 2 on the upper surface of the rigid foam board 1. Obviously, the depth of the grooves is less than the thickness of the rigid foam board 1. Specifically, the grooves include groove A4 and groove B5. The depth of the groove A4 is less than the depth of the groove B5. The ends of the grooves A4 and B5 are both open. The groove A4 is a shallow groove, and its depth can be one tenth to one sixth of the thickness of the rigid foam board 1. The groove B5 is a deep groove, and its depth can be seven eighths to nine tenths of the thickness of the rigid foam board 1. Of course, the depth of the groove can be designed according to experiments, needs, etc., and is not limited.

It is understandable that the mesh cloth 2 on the upper surface is cut off by opening shallow grooves and deep grooves, destroying the continuity of the mesh cloth 2 on the upper surface, so that the mesh cloth 2 is only attached to the hard foam on the upper surface. However, the mesh cloth 2 on the lower surface of the hard foam still plays the role of opening deep grooves and breaking the pieces to prevent them from scattering;

After the grooves are formed, the reinforcing material 3 is poured on the mesh cloth 2 on the upper surface of the rigid foam board 1. The surface reinforcing material 3 and the reinforcing material 3 in the groove form a whole. The reinforcing material 3 can be glass fiber reinforced plastic or other types of resins. In this embodiment, the reinforcing material 3 is preferably glass fiber reinforced plastic, which is also called GFRP, i.e. fiber reinforced plastic, generally refers to a reinforced plastic that uses glass fiber to reinforce an unsaturated polyester, epoxy resin and phenolic resin matrix, and uses glass fiber or its products as the reinforcing material 3, which is called glass fiber reinforced plastic, or glass fiber reinforced plastic;

Furthermore, after the glass fiber reinforced plastic is poured, since the mesh cloth 2 is cut off during the grooving, the surface glass fiber reinforced plastic and the glass fiber reinforced plastic in the shallow groove and the deep groove form a whole, and during the shear or peeling test, a reaction force generated by the extrusion resistance opposite to the action force will be formed in the shallow groove and the deep groove, thereby increasing the action force during the shear or peeling test;

When performing a peel test, the surface mesh cloth 2 loses its continuity after being cut by the deep and shallow grooves, and the force applied to the surface of the mesh cloth 2 is transformed into the force applied to the surfaces of multiple small squares after the mesh cloth 2 is cut, which disperses the pulling force during peeling and increases the peel strength.

Among them, a plurality of grooves A 4 and grooves B 5 are arranged in parallel at intervals along the length direction and the width direction of the rigid foam board 1. The spacing between adjacent parallel grooves A 4 can be 20 mm, and the spacing between adjacent parallel grooves B 5 can be 30 mm.

In a specific implementation, the grooves A 4 and the grooves B 5 in the same direction may also be arranged alternately in sequence.

The following are some experimental plans for improving the research process:

Solution A: Verify the effect of different hole spacing on peel strength:

By increasing the number of holes (changing the hole spacing), we tested whether there was any effect on the peeling performance. The experiment tested three groups of data with different spacings. Each group was tested three times and the average was taken. The test spacings were 10*10mm, 15*15mm, and 20*20mm respectively. The deep groove surface peeling data comparison is as follows:

After adding the mesh cloth (i.e. the aforementioned mesh cloth), the mesh cloth surface peeling data comparison is as follows:

Punching spacing Number of holes punched in the peeling area Peel strength, N.mm/mm 20*20mm 64 56.42 15*15mm 100 58.41 10*10mm 210 62.77

According to the comparative analysis of the above test data, the hole spacing has a certain influence on the peeling strength, but to achieve a significant improvement, it is necessary to significantly reduce the hole spacing to a certain extent to achieve the goal, and the peeling strength can be improved by adding mesh cloth;

Solution B: Deep groove mesh

Mesh surface (with shallow groove) (HPE160), process: deep groove spacing 30*30mm, shallow groove spacing 20*20mm, hole spacing 20*20mm;

Experimental sample a: the process is mesh surface (the mesh is not interrupted);

Experimental sample b: the process is mesh surface (mesh interrupted);

Peel strength, N.mm/mm Mesh surface (mesh is not interrupted) 56.42 Mesh surface (mesh interrupted) 66.68

Deep groove surface (HPE160): Conventional process: deep groove spacing 30*30mm, shallow groove spacing 20*20mm, hole spacing 20*20mm;

Experimental sample c: The process is deep groove surface without cloth pasting;

Experimental sample d: the process is deep groove surface patching (interrupted);

Peel strength, N.mm/mm Deep groove surface without cloth 31.15 Deep groove patch (interrupted) 50.46

Supplementary verification test

Effect of mesh on peeling: (HPE110)

The experimental sample uses the web process (double-sided cross shallow groove 20*20mm + punching 20*20mm), and the mesh is added to one side of the same plate;

Peel strength, N.mm/mm Deep groove surface without cloth 32.52 Deep groove patch (interrupted) 52.48

As shown in Figure 8, it is a bar chart of the effect of mesh on peel strength. It can be seen from Figure 8 that adding mesh to the deep groove surface and interrupting it can effectively improve the peel strength. Compared with the conventional deep groove surface without mesh, the peel strength increases by 17.25N.mm/mm, an increase of 55.38% year-on-year.

Principle analysis: adding mesh

As shown in Figure 4, it is a conventional design in the prior art (deep grooves and punching holes are the same points and are not used as reference);

Where: M—peel strength (N/mm); Pb—average peel load (N); P0—resistance load (N); D—roller boss diameter (mm); d—roller diameter (mm); b—sample width (mm);

When the samples are exactly the same, the only variable is Pb (average peel load), which is the average force at each position during peeling; increasing the force used during peeling at each position can improve the peel strength.

As shown in Figure 5, it is the design drawing of adding mesh and adding shallow grooves (deep grooves and holes are the same points and are not used as reference);

According to the diagram, in the peel test experiment, when the roller applies force according to the specified loading speed, the factors affecting the force are:

1. The opposing force F3 generated by the bonding between the mesh and the shell during peeling

2. The force F1 generated by both sides of the shallow groove during peeling to resist extrusion

3. The opposing force F2 generated at the bottom of the shallow groove during peeling

When/> When P↑

when When, />

As shown in Figure 6, it is a design diagram of shallow groove + patch (the whole mesh is not interrupted). In the actual test process, adding mesh on the shell surface does help to increase the peeling strength; because the mesh is pasted as a whole sheet, due to the continuity of the whole mesh, the mesh and the FRP are peeled off together during the test, and the FRP on the surface and the FRP in the shallow groove are separated by the mesh, which cannot form a good match with the shallow groove;

As shown in Figure 7, it is a design drawing of shallow groove + pasting (after pasting, the groove is opened and the mesh is cut off). After the mesh is pasted, the shallow groove of the shell is opened and the mesh is cut off together. During the peeling test after infusion, the surface fiberglass and the fiberglass in the shallow groove form a whole, which increases the resistance during peeling; and after the mesh is cut off, there is no continuity, and the force on one overall surface is transformed into the force on multiple small square surfaces, which disperses the tensile force during peeling, thereby greatly increasing the peeling strength.

Example 2

Based on Example 1, as shown in FIG9 , this embodiment further includes, before the step of pouring the reinforcing material 3, opening a plurality of parallel grooves C 6 along the depth direction on the side walls of grooves A 4 and grooves B 5. The cross-sectional shape of grooves C 6 may be rectangular, semicircular, triangular, etc., without limitation, and the size may be designed according to requirements. By designing grooves C 6, after the reinforcing material is poured, the surface reinforcing material, grooves A 4, grooves B 5 and grooves C 6 are integrated into a whole, which can further improve the peeling strength.

In summary, the present invention provides a hard foam processing technology, firstly, mesh cloth 2 is respectively attached to the upper surface and the lower surface of the hard foam board 1; after the mesh cloth 2 is attached, a plurality of shallow grooves and deep grooves are opened on the mesh cloth 2 on the upper surface of the hard foam board 1; after the grooving is completed, reinforcing material 3 is poured on the mesh cloth 2 on the upper surface of the hard foam board 1, and the surface reinforcing material 3 and the reinforcing material 3 in the groove form a whole, and the shear strength and peel strength after actual pouring are significantly improved by matching the deep and shallow grooves opened on the surface and adding the mesh cloth 2, and the performance requirements of customers are met by improving the process performance after material pouring, and the width and breadth of products are expanded by optimizing the process structure of hard foam, and the processing capacity of different process products is improved by optimizing the process processing method.

It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, some steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims (6)

1. The hard foam processing technology is characterized by comprising the following steps of:

respectively attaching mesh fabrics to the upper surface and the lower surface of the hard foam board;

after the grid cloth is attached, a plurality of grooves are formed in the grid cloth on the upper surface of the rigid foam board, the grooves cut off the grid cloth, each groove comprises a groove A and a groove B, and the depth of each groove A is smaller than that of each groove B;

after slotting, reinforcing materials are poured on the grid cloth on the upper surface of the rigid foam board, and the surface reinforcing materials and the reinforcing materials in the grooves form a whole.

2. The rigid foam processing technology according to claim 1, wherein a plurality of grooves a and grooves B are formed in parallel at intervals along the length direction and the width direction of the rigid foam board.

3. A rigid foam processing procedure according to claim 2, wherein the grooves a and the grooves B in the same direction are alternately arranged in sequence.

4. A rigid foam processing procedure according to claim 3, wherein the ends of both the groove a and the groove B are open.

5. The rigid foam processing technique of claim 1, further comprising, prior to the step of infusing the reinforcing material:

a plurality of parallel grooves C are formed in the side walls of the grooves A and B along the depth direction.

6. A rigid foam processing procedure according to claim 1, characterized in that the reinforcing material is glass fibre reinforced plastic.