CN110885640A

CN110885640A - Synchronous bonding process for sun shield skin and label

Info

Publication number: CN110885640A
Application number: CN201911204538.3A
Authority: CN
Inventors: 陈晓婉
Original assignee: SHANGHAI ZIYUAN AUTOMOBILE COMPONENTS AND PARTS CO Ltd
Current assignee: SHANGHAI ZIYUAN AUTOMOBILE COMPONENTS AND PARTS CO Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-17
Anticipated expiration: 2039-11-29
Also published as: CN110885640B

Abstract

The invention relates to a synchronous bonding process of a sun shield skin and a label, which comprises the following steps: (1) placing the sun shield filler on a jig, and paving a surface skin pre-coated with the adhesive; (2) after positioning the surface, placing a label pre-coated with adhesive; (3) the skin and the label are weighted with certain pressure and heat synchronously, and the adhesive is promoted to be deactivated and crystallized through the wrapping pressure and heat conduction, so that the purposes of bonding the skin and the filler and bonding the skin and the label are achieved. Compared with the prior art, the method has the advantages that the two processes of surface adhesion and label adhesion are combined, so that the equipment investment required by production is reduced, and the production takt is improved. The skin adhesive is prevented from having local inconsistency of skin touch due to the secondary weighting of the skin adhesive caused by the heat and the pressure required by labeling, the local hardening of the skin and the occurrence of impression problems, in addition, the production cost is saved, the production beat is improved, and meanwhile, the qualification rate of semi-finished products of key node step sequences of the assemblies is improved.

Description

Synchronous bonding process for sun shield skin and label

Technical Field

The invention belongs to the technical field of part bonding, and relates to a synchronous bonding process of a sun shield skin and a label.

Background

When the sun shield is processed, the skin and the label are generally divided into two procedures to be finished respectively, and the used colloid has larger difference due to the property difference of the bonding surface. This, in turn, generally creates the following problems: 1. different colloids are not beneficial to uniformity of manufacturability, and operation is troublesome; 2. the surface skin and the label are separately pressed by different processes, and the problem of mutual activation exists, so that the quality defect problem is caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a process for synchronously bonding a sun visor skin and a label.

The purpose of the invention can be realized by the following technical scheme:

a process for synchronously bonding a sun shield skin and a label comprises the following steps:

(1) placing the sun shield filler in the jig;

(2) then, spreading the adhesive-coated skin on the sun visor filler;

(3) then, coating the adhesive on the label and standing the label on the surface;

(4) and applying pressure and heating to the three-layer structure of the sun shield filler, the surface skin and the label to inactivate and crystallize the binder, so that the surface skin and the sun shield filler as well as the surface skin and the label are synchronously bonded and fixed.

Further, the adhesive applied between the sun visor filler and the skin is SikaMelt-9181 cement available from Sika corporation. Further, the adhesive applied between the skin and the label is 81ONS glue available from 3M company.

In the present invention, the adhesive preferably employs SikaMelt-9181 glue from Sika and 81ONS glue from 3M, which have the following characteristics: after the composition is labeled, the adhesive has the characteristics of 10 minutes activity at the ambient temperature of 22 ℃, and has the characteristics of repeated adjustment, namely sliding movement and the like in the activity state. Meanwhile, the crystallization aging process of the binder is inversely proportional to the crystallization environment temperature. Under the condition of normal temperature of 22 ℃, the bonding strength aging needs 20 minutes, and under the crystallization environment temperature of 125 ℃, the bonding strength aging needs only 15 seconds, so that the same effect of normal temperature of 20 minutes can be achieved.

Furthermore, when the label is placed on the surface, the phenomenon that the adhesive is remained outside the non-label adhesive area is avoided, and the label is required to be placed and positioned according to positioning.

Further, the glue coating amount between the sun visor filling body and the epidermis is 30g/m²And the coating amount of the adhesive between the surface skin and the label is 0.015g/cm²。

Furthermore, the adhesive is applied by: the crystal of the glue is activated at high temperature, and the surface skin and the sun shield filling body are fully bonded through high pressure, so that the purpose of sticking is achieved.

Due to the adhesive force of the adhesive, the adhesive touch, the crystallization degree and the layer thickness of the adhesive have a direct relation with the crystallization environment temperature. When the thickness of the adhesive layer is insufficient, the adhesive strength is insufficient, and the adhesive layer is crystallized, and the touch is hard. When the thickness of the binder layer is too large, the binder crystallization aging is long, and the binder crystallization layers are difficult to unify, so that the touch of the binder layer is likely to be inconsistent, and local stress marks due to inconsistent crystallization appear on the surface. By the above coating technique, the coating amount of the binder of the present invention can be ensured within an appropriate range.

Further, in the step (4), the applied pressure satisfies the following conditions: the pressure of the unit area of the surface skin and the label is 1.18 +/-0.2N/cm²。

Further, in the step (4), the temperature of the heat source during heating is 155-.

Further, in the step (4), the heating treatment process satisfies the following conditions: the three-layer structure of the sun shield filler, the surface skin and the label is processed by hot pressing, so that the temperature of the adhesive between the surface skin and the sun shield filler reaches 125 ℃, the (average) temperature of the adhesive between the label and the surface skin reaches 125 ℃, and then the pressure is maintained for 10-15 s.

The same type of binder is preferred in the present invention because the two binder layers have different relative distances to the crystallization ambient temperature application source (i.e., heat source). In the same weighted aging, the heat conduction quantity of the adhesive layer at the label is different, and the surface average temperature is different, namely the heat conduction quantity of the adhesive layer at the label position is larger than that of the adhesive layer at the surface skin position, so that the adhesive layer of the label is crystallized before the adhesive layer of the surface skin, the effect of consistent touch feeling of the surface skin can be achieved while the adhesive strength is ensured.

In the invention, the crystallization environment temperature is too high, and the heat conduction quantity is large, so that the crystallization speed of the bonding agent layer is too high, the crystal stress phenomenon occurs, and the local stress mark is caused. If the crystallization environment temperature is too low, the crystallization aging is lengthened, which is not beneficial to the management and control of the production cycle, and if the weight is biased to the cycle management and control under the condition, the bonding agent layer is not crystallized, the bonding force after the bonding strength aging cannot be reached, and the bonding failure is caused.

Compared with the prior art, the invention has the following advantages:

(1) the two processes of surface bonding and label bonding are combined, so that the equipment investment required by production is reduced, and the production takt is improved. The problems that the touch sense of the surface skin is locally different, the surface skin is locally hard and the impression is caused by secondary processing of the surface skin adhesive due to the heat and the pressure which need to be applied for labeling are avoided.

(2) Under the action of external pressure, the molecular chains of the binding agent are promoted to be entangled with the respective molecular chains of the epidermis, the filling body and the label. When the molecular chain is well entangled, the application of external heat shortens the strength aging of the adhesive, so that each adhesive part completes the strength bonding aging in the jig to achieve the fixing effect. After the bonding strength is aged, the crystal can be completely crystallized in 48 hours under the normal temperature condition. Thus, the requirements for ambient temperature and moderate control are reduced. And further, the production cost can be reduced, and the production takt can be improved.

Detailed Description

The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

In the following examples, unless otherwise specified, all of the conventional commercial raw materials or conventional processing techniques in the art are used.

Example 1:

(1) two sun shield filling bodies, namely a positive piece and a negative piece, are placed in the fixed jig and are placed at corresponding positions of the jig.

(2) The skin coated with the adhesive was laid on two sheets of sun visor fillers while the adhesive was in an active state (SikaMelt-9181 adhesive has a property that the adhesive has an active property for 10 minutes at an ambient temperature of 22 ℃ C. and a property of repeated adjustment in an active state), and has characteristics such as sliding movement. The epidermis is moved to the corresponding range on the jig. And to smooth out the locations where wrinkles appear when the epidermis is laid. So that the surface skin is smoothly paved on the filling body.

(3) The tag is rested on the epidermis by means of a reference positioning. (the SikaMelt-9181 adhesive has a characteristic of repeated adjustment in an active state, but needs to be positioned with reference to positioning in order to avoid the occurrence of a phenomenon in which an adhesive remains outside a non-label-adhering region.)

(4) Weighting the three-layer structured sun shield filler, the skin and the label by using a weighting tool to obtain a certain pressure and heat (the skin and the label are weighted by 1.18 +/-0.2N/cm)²Under the condition of pressure, the total heat of 155-175 ℃ is weighted, and the average temperature of the adhesive layers of the skin and the sun visor filler reaches 70 ℃ and the average temperature of the adhesive layers of the label and the skin reaches 125 ℃ through the heat conduction effect. And the pressure is maintained for 10-15s through an envelope pressing process). Promoting the molecular chain entanglement effect of the binder and the inactivation reaction of the molecular chain structure. The reaction energy efficiency is increased and the reaction aging is shortened.

The product was obtained by example 1. And (3) carrying out a pull-off test at the temperature of 140 ℃, so that the sun shield filler body is damaged, and the adhesive layer still effectively adheres the skin and the label to the filler. Under the state of normal temperature of 22 ℃, the peak value of the bonding strength between the skin and the body reaches 0.64N/mm²The overall peel was greater than 10N in the 100mm/min accelerated peel force test.

Similarly, if the label is bonded to the skin in steps, with reference to the process of example 1, and the specific process parameters are appropriately adjusted, the following occurs: 1) the label reaches 0.64N/mm²When the equivalent adhesive strength is at the peak, the surface skin corresponds to the label area, and the phenomenon of hard touch or stress impression occurs. 2) The peak value of the adhesive strength of the label is lower than 0.64N/mm on the premise of ensuring the touch of the surface skin²The requirement of the consistency of the bonding strength between the surface skin and the label cannot be met. 3) This condition occurs in both conditions 1) and 2)When the label is adhered for the second time, the surface adhesive layer is not completely crystallized, and the surface has the phenomena of local displacement, dislocation of grains and local crumpling when the label is adhered.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. A process for synchronously bonding a sun shield skin and a label is characterized by comprising the following steps:

(1) placing the sun shield filler in the jig;

(2) then, spreading the adhesive-coated skin on the sun visor filler;

2. The process of claim 1 wherein the adhesive applied between the filler and the skin of the sun visor is Sikamelt-9181 adhesive available from Sika corporation.

3. The process of claim 2 wherein the adhesive applied between the skin and the label is 81ONS glue available from 3M company.

4. A sun visor according to claims 1 and 2The synchronous bonding process of the skin and the label is characterized in that the coating amount of the adhesive coated on the filler of the sun visor and the skin is 30g/m²。

5. The process for simultaneously adhering a sun visor skin and a label according to claims 1 and 2, wherein the amount of the adhesive coated on the label is 0.015g/cm²。

6. The process of claim 4 wherein the activation temperature and activation time of the two adhesives are close so that the process of simultaneously adhering the sun visor filler to the skin and adhering the skin to the label can be achieved.

7. The process for simultaneously adhering the skin and the label of the sun visor according to claim 1, wherein the pressure applied in the step (4) is as follows: the pressure of the unit area of the surface skin and the label is 1.18 +/-0.2N/cm²。

8. The process for simultaneously adhering the skin and the label of the sun visor of claim 1, wherein in the step (4), the activation temperature of the two adhesives is 125-155 ℃.

9. The process for synchronously bonding the sun visor skin and the label according to claim 1 or 8, wherein in the step (4), the heating treatment process satisfies the following conditions: the three-layer structure of the sun shield filler, the surface skin and the label is processed through hot pressing, so that the temperature of the adhesive between the surface skin and the sun shield filler reaches 125 ℃, the temperature of the adhesive between the label and the surface skin reaches 125 ℃, and then the pressure is maintained for 10-15 s.