CN103358543A - Ultrasonic welding method for wood-plastic composite - Google Patents

Ultrasonic welding method for wood-plastic composite Download PDF

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Publication number
CN103358543A
CN103358543A CN201310316744XA CN201310316744A CN103358543A CN 103358543 A CN103358543 A CN 103358543A CN 201310316744X A CN201310316744X A CN 201310316744XA CN 201310316744 A CN201310316744 A CN 201310316744A CN 103358543 A CN103358543 A CN 103358543A
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CN
China
Prior art keywords
plastic composite
wood plastic
wood
ultrasonic welding
energy
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CN201310316744XA
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Chinese (zh)
Inventor
赵辉
王清文
祝虹媛
王伟宏
周一龙
王海刚
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东北林业大学
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Priority to CN201310316744XA priority Critical patent/CN103358543A/en
Publication of CN103358543A publication Critical patent/CN103358543A/en

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Abstract

The invention provides an ultrasonic welding method for a wood-plastic composite, and belongs to the technical field of wood-plastic composite connection methods. The method comprises: 1) preparation of an energy-conducting strip: performing hot press molding on the raw materials comprising 94-98% by weight of polypropylene and 2-6% by weight of maleic anhydride grafted polypropylene to obtain the energy-conducting strip; 2) placing the energy-conducting strip between two wood-plastic composites; 3) heating the contact surface of the two wood-plastic composites by using the energy of ultrasonic waves to generate a partial melt state; 4) increasing pressure through a pneumatic device to fuse the surfaces of the two wood-plastic composites; and 5) processing the welded surface of the wood-plastic composite. By stretching of a universal mechanics tester, a test piece has a breakage at the body but not at the welded joint, thereby it is illustrated that the shear stress borne by the welded surface exceeds the ultimate tension of the body of the wood-plastic composite, and the demand of rapid seamless connection wood-plastic composites is satisfied.

Description

A kind of wood plastic composite ultrasonic welding method

Technical field

The present invention relates to a kind of wood plastic composite ultrasonic welding method, belong to wood plastic composite method of attachment technical field.

Background technology

Wood plastic composite is a kind of advanced composite material (ACM) that string and high molecular polymer Compound Machining are made.This novel material combines the double dominant of lignocellulosic material and polymeric material, have the advantages that mechanical property is good, case hardness is high, hot retractility is good, water-fast, wear-resisting, brought into play the workability of timber and processing method diversity, the flexibility of plastics.Plastic raw materials commonly used in the wood plastic composite has PE, PP, PVC etc.

Using maximum modes during wood plastic composite connects is that mechanical connection is connected with splicing.Mechanical connection is exactly in end or the prebored hole of limit section of sheet material, to avoid breaking.Yet because the elasticity of wood plastic composite itself may cause the mechanical property of material to reduce to its prebored hole, the size in hole and hole back gauge etc. have a great impact the intensity of mechanical connection.

It is lightweight glueing joint the characteristics that connect, stress distribution is continuous, sealing is good, can give the joint property (such as conduction, heat conduction, sealing, corrosion protection), smooth-shaped is neat, technique is simple, cycle is short, can save a large amount of advantages such as artificial, be specially adapted to unlike material, different-thickness is connected connection with the complex configuration member, but it is non-dismountable to glued joint syndeton, can't correction error, generally when maintenance, use, polymer glueds joint the easy variation with temperature of intensity and changes, and most of adhesives are being subject to some solvent, when affecting, oxidant or ray change easily; It is cumbersome glueing joint the cleaning on surface and the process of specially treated, and the consumption of adhesive requires accurately control.

Summary of the invention

The objective of the invention is in order to solve the problem of above-mentioned prior art existence, be that the boring slit that exists in the wood plastic composite mechanical connection manner is large, the adhesive that exists in glued joint connecting very easily changes and causes the wood plastic composite can't correction error, and the trouble that Bonding Process and subsequent treatment are brought.And then provide a kind of wood plastic composite ultrasonic welding method.

The objective of the invention is to be achieved through the following technical solutions:

A kind of wood plastic composite ultrasonic welding method, step is as follows:

Step 1: making leading of wood plastic composite can bar: raw material is the polypropylene of 94-98% and 2~6% maleic anhydride inoculated polypropylene by weight, and utilizing thermoforming way to make to lead can bar;

Step 2: lead the energy bar with placing between two wood plastic composites that will weld;

Step 3: utilize hyperacoustic energy that two wood plastic composite contact surfaces are heated, produce the partial melting state;

Step 4: through pneumatic means pressurization, cooling two wood plastic composite surfaces are merged again;

Step 5: process on the surface of wood plastic composite to welding;

Described cross section of leading the energy bar is approximately triangle, and the length of leading the energy bar is 20~25mm, the long 2.0~2.5mm of rib, and the indent amount is less than 1mm;

The parameter of ultrasonic welding machine is selected as follows in the described step 3:

Sending out the time of shaking is 4~5s, and vibration frequency is 12000~18000Hz, and the dwell time is 4~6s, and cylinder pressure is 0.4~0.6MPa, and acting on the solder side pressure at right angle is 1200~1800N.

Ultrasonic welding machine of the present invention is comprised of supersonic generator and transducer, supersonic generator produces the high-frequency electrical vibration that certain power stage is arranged, transducer is converted to mechanical energy with this high-frequency electrical vibration, make the instrument end face make dither about 15000Hz through ultrasonic transformer, exerting pressure by cylinder is loaded into this dither on the wood plastic composite, can make its interface melting and bonding.

Wood plastic composite through ultrasonic bonding, by stretching at omnipotent test machine for mechanism, test specimen shear to disconnect from the commissure, but in the fracture of body place, illustrates that shearing force that solder side can bear has surpassed the tension limiting force of wood plastic composite body; Leading can increase weld strength by bar, and under certain welding parameter, weld strength can surpass body intensity, leads to have more advantage by bar when welding complex combination face.

Beneficial effect of the present invention, the connection of material can be in seconds finished in ultrasonic bonding, and speed is fast, and good airproof performance has satisfied the requirement of quick seamless link wood plastic composite.

Description of drawings

Fig. 1 leads to make schematic diagram by bar;

Fig. 2 is the structural representation (l among the figure is the length of leading the energy bar, and a is the rib length of leading the energy bar) of leading the energy bar;

Fig. 3 is ultrasonic bonding wood plastic composite schematic diagram.

Reference numeral 1 among Fig. 3 is supersonic generator, the 2nd, and ultrasonic bonding head, the 3rd, top soldered wood plastic composite, the 4th, following soldered wood plastic composite, the 5th, mould or anchor clamps.

The specific embodiment

The present invention is described in further detail below in conjunction with accompanying drawing: present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment, but protection scope of the present invention is not limited to following embodiment.

Such as Fig. 1~shown in Figure 3, a kind of wood plastic composite ultrasonic welding method that present embodiment is related, step is as follows:

Step 1: making leading of wood plastic composite can bar: raw material is the polypropylene of 94-98% and 2~6% maleic anhydride inoculated polypropylene by weight, and utilizing thermoforming way to make to lead can bar;

Step 2: lead the energy bar with placing between two wood plastic composites that will weld;

Step 3: utilize hyperacoustic energy that two wood plastic composite contact surfaces are heated, produce the partial melting state;

Step 4: through pneumatic means pressurization, cooling two wood plastic composite surfaces are merged again;

Step 5: process on the surface of wood plastic composite to welding;

Described cross section of leading the energy bar is approximately triangle, and the length of leading the energy bar is 20~25mm, the long 2.0~2.5mm of rib, and the indent amount is less than 1mm;

The parameter of ultrasonic welding machine is selected as follows in the described step 3:

Sending out the time of shaking is 4~5s, and vibration frequency is 12000~18000Hz, and the dwell time is 4~6s, and cylinder pressure is 0.4~0.6MPa, and acting on the solder side pressure at right angle is 1200~1800N.

Further, leading of described making wood plastic composite can bar: the better raw material that is chosen as is 96% polypropylene and 4% maleic anhydride inoculated polypropylene by weight, and utilizing thermoforming way to make to lead can bar.

Described leading can the better length of bar be 22mm, the long 2.2mm of rib, and the indent amount is 0.8mm.

The better parameter of ultrasonic welding machine is selected as follows in the described step 3: sending out the time of shaking is 4s, and vibration frequency is 12000Hz, and the dwell time is 4s, and cylinder pressure is 0.4MPa, and acting on the solder side pressure at right angle is 1200N.

A described better time of shaking is 5s, and vibration frequency is 18000Hz, and the dwell time is 6s, and cylinder pressure is 0.6MPa, and acting on the solder side pressure at right angle is 1800N.

A described better time of shaking is 4.5s, and vibration frequency is 15000Hz, and the dwell time is 5s, and cylinder pressure is 0.5MPa, and acting on the solder side pressure at right angle is 1500N.

The above; only be the better specific embodiment of the present invention; these specific embodiment all are based on the different implementations under the general idea of the present invention; and protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (6)

1. a wood plastic composite ultrasonic welding method is characterized in that,
Step 1: making leading of wood plastic composite can bar: raw material is the polypropylene of 94-98% and 2~6% maleic anhydride inoculated polypropylene by weight, and utilizing hot-press molding method to obtain leading can bar;
Step 2: lead the energy bar with placing between two wood plastic composites that will weld;
Step 3: utilize hyperacoustic energy that two wood plastic composite contact surfaces are heated, produce the partial melting state;
Step 4: through pneumatic means pressurization, cooling two wood plastic composite surfaces are merged again;
Step 5: process on the surface of wood plastic composite to welding.
Described cross section of leading the energy bar is approximately triangle, and the length of leading the energy bar is 20~25mm, the long 2.0~2.5mm of rib, and the indent amount is less than 1mm;
The parameter of ultrasonic welding machine is selected as follows in the described step 3:
Sending out the time of shaking is 4~5s, and vibration frequency is 12000~18000Hz, and the dwell time is 4~6s, and cylinder pressure is 0.4~0.6MPa, and acting on the solder side pressure at right angle is 120~180N.
2. wood plastic composite ultrasonic welding method according to claim 1 is characterized in that, leading of described making wood plastic composite can bar: raw material is 96% polypropylene and 4% maleic anhydride inoculated polypropylene by weight.
3. wood plastic composite ultrasonic welding method according to claim 1 is characterized in that, the described length of leading the energy bar is 22mm, the long 2.2mm of rib, and the indent amount is 0.8mm.
4. wood plastic composite ultrasonic welding method according to claim 1, it is characterized in that, the parameter of ultrasonic welding machine is selected as follows in the described step 3: sending out the time of shaking is 4s, vibration frequency is 12000Hz, dwell time is 4s, cylinder pressure is 0.4MPa, and acting on the solder side pressure at right angle is 1200N.
5. wood plastic composite ultrasonic welding method according to claim 1 is characterized in that, described the time of shaking is 5s, and vibration frequency is 18000Hz, and the dwell time is 6s, and cylinder pressure is 0.6MPa, and acting on the solder side pressure at right angle is 1800N.
6. wood plastic composite ultrasonic welding method according to claim 1 is characterized in that, described the time of shaking is 4.5s, and vibration frequency is 15000Hz, and the dwell time is 5s, and cylinder pressure is 0.5MPa, and acting on the solder side pressure at right angle is 1500N.
CN201310316744XA 2013-07-25 2013-07-25 Ultrasonic welding method for wood-plastic composite CN103358543A (en)

Priority Applications (1)

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CN201310316744XA CN103358543A (en) 2013-07-25 2013-07-25 Ultrasonic welding method for wood-plastic composite

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63176134A (en) * 1987-01-19 1988-07-20 Toyota Motor Corp Method of fitting parts to ligneous board by ultrasonic wave
WO1996001377A1 (en) * 1994-07-01 1996-01-18 Createc Patent Holding S.A. Method of joining together parts consisting at least partly of wood or wood-like materials
US6141874A (en) * 1996-05-17 2000-11-07 Andersen Corporation Window frame welding method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63176134A (en) * 1987-01-19 1988-07-20 Toyota Motor Corp Method of fitting parts to ligneous board by ultrasonic wave
WO1996001377A1 (en) * 1994-07-01 1996-01-18 Createc Patent Holding S.A. Method of joining together parts consisting at least partly of wood or wood-like materials
US6141874A (en) * 1996-05-17 2000-11-07 Andersen Corporation Window frame welding method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
周一龙,赵辉,祝虹媛: "木塑复合板材的超声波直角焊接性能试验", 《东北林业大学学报》, vol. 40, no. 11, 30 November 2012 (2012-11-30), pages 116 - 119 *

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